15500 has 24 divisors (see below), whose sum is σ = 34944. Its totient is φ = 6000.

The previous prime is 15497. The next prime is 15511. The reversal of 15500 is 551.

15500 is nontrivially palindromic in base 9.

15500 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

15500 is an esthetic number in base 9, because in such base its adjacent digits differ by 1.

It is a hoax number, since the sum of its digits (11) coincides with the sum of the digits of its distinct prime factors.

15500 is an undulating number in base 9.

It is a nialpdrome in base 5.

It is a zygodrome in base 5.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 485 + ... + 515.

It is an arithmetic number, because the mean of its divisors is an integer number (1456).

2¹⁵⁵⁰⁰ is an apocalyptic number.

15500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a pronic number, being equal to 124×125.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17472).

15500 is an abundant number, since it is smaller than the sum of its proper divisors (19444).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15500 is a wasteful number, since it uses less digits than its factorization.

15500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50 (or 38 counting only the distinct ones).

The product of its (nonzero) digits is 25, while the sum is 11.

The square root of 15500 is about 124.4989959799. The cubic root of 15500 is about 24.9331547612.

It can be divided in two parts, 15 and 500, that added together give a palindrome (515).

The spelling of 15500 in words is "fifteen thousand, five hundred".