18039232 has 28 divisors (see below), whose sum is σ = 36210240. Its totient is φ = 8915456.

The previous prime is 18039209. The next prime is 18039233. The reversal of 18039232 is 23293081.

It is a super-2 number, since 2×18039232² = 650827782299648, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18039232.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18039233) 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, 4113 + ... + 7279.

Almost surely, 2^18039232 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18039232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18105120).

18039232 is an abundant number, since it is smaller than the sum of its proper divisors (18171008).

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

18039232 is an equidigital number, since it uses as much as digits as its factorization.

18039232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3268 (or 3258 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 18039232 is about 4247.2617060878. The cubic root of 18039232 is about 262.2644029733.

The spelling of 18039232 in words is "eighteen million, thirty-nine thousand, two hundred thirty-two".