15949 has 4 divisors (see below), whose sum is σ = 16380. Its totient is φ = 15520.

The previous prime is 15937. The next prime is 15959. The reversal of 15949 is 94951.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2025 + 13924 = 45^2 + 118^2 .

It is a cyclic number.

It is not a de Polignac number, because 15949 - 2¹¹ = 13901 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 7.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 154 + ... + 235.

It is an arithmetic number, because the mean of its divisors is an integer number (4095).

2¹⁵⁹⁴⁹ is an apocalyptic number.

It is an amenable number.

15949 is a deficient number, since it is larger than the sum of its proper divisors (431).

15949 is an equidigital number, since it uses as much as digits as its factorization.

15949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430.

The product of its digits is 1620, while the sum is 28.

The square root of 15949 is about 126.2893503032. The cubic root of 15949 is about 25.1716191785.

The spelling of 15949 in words is "fifteen thousand, nine hundred forty-nine".