18140 has 12 divisors (see below), whose sum is σ = 38136. Its totient is φ = 7248.

The previous prime is 18133. The next prime is 18143. The reversal of 18140 is 4181.

It is a happy number.

18140 is nontrivially palindromic in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18143) 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, 434 + ... + 473.

It is an arithmetic number, because the mean of its divisors is an integer number (3178).

2¹⁸¹⁴⁰ is an apocalyptic number.

18140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18140 is an abundant number, since it is smaller than the sum of its proper divisors (19996).

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

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19068).

18140 is a wasteful number, since it uses less digits than its factorization.

18140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 916 (or 914 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 18140 is about 134.6848172587. The cubic root of 18140 is about 26.2751836925.

The spelling of 18140 in words is "eighteen thousand, one hundred forty".