18331432 has 16 divisors (see below), whose sum is σ = 39281760. Its totient is φ = 7856304.

The previous prime is 18331429. The next prime is 18331433. The reversal of 18331432 is 23413381.

It is a junction number, because it is equal to n+sod(n) for n = 18331397 and 18331406.

It is not an unprimeable number, because it can be changed into a prime (18331433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 163618 + ... + 163729.

It is an arithmetic number, because the mean of its divisors is an integer number (2455110).

Almost surely, 2^18331432 is an apocalyptic number.

It is an amenable number.

18331432 is an abundant number, since it is smaller than the sum of its proper divisors (20950328).

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

18331432 is a wasteful number, since it uses less digits than its factorization.

18331432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327360 (or 327356 counting only the distinct ones).

The product of its digits is 1728, while the sum is 25.

The square root of 18331432 is about 4281.5221592326. The cubic root of 18331432 is about 263.6728807270.

The spelling of 18331432 in words is "eighteen million, three hundred thirty-one thousand, four hundred thirty-two".