18039432 has 16 divisors (see below), whose sum is σ = 45098640. Its totient is φ = 6013136.

The previous prime is 18039419. The next prime is 18039443. The reversal of 18039432 is 23493081.

It is a super-2 number, since 2×18039432² = 650842213765248, 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 18039432.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 375798 + ... + 375845.

It is an arithmetic number, because the mean of its divisors is an integer number (2818665).

Almost surely, 2^18039432 is an apocalyptic number.

18039432 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18039432 is an abundant number, since it is smaller than the sum of its proper divisors (27059208).

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

18039432 is a wasteful number, since it uses less digits than its factorization.

18039432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 751652 (or 751648 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 18039432 is about 4247.2852506042. The cubic root of 18039432 is about 262.2653722068.

The spelling of 18039432 in words is "eighteen million, thirty-nine thousand, four hundred thirty-two".