18390032 has 20 divisors (see below), whose sum is σ = 35979840. Its totient is φ = 9104928.

The previous prime is 18390023. The next prime is 18390049. The reversal of 18390032 is 23009381.

It is a super-2 number, since 2×18390032² = 676386553922048, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18389983 and 18390010.

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, 3932 + ... + 7227.

It is an arithmetic number, because the mean of its divisors is an integer number (1798992).

Almost surely, 2^18390032 is an apocalyptic number.

It is an amenable number.

18390032 is a deficient number, since it is larger than the sum of its proper divisors (17589808).

18390032 is a wasteful number, since it uses less digits than its factorization.

18390032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11270 (or 11264 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 18390032 is about 4288.3600595099. The cubic root of 18390032 is about 263.9535424832.

The spelling of 18390032 in words is "eighteen million, three hundred ninety thousand, thirty-two".