18390432 has 48 divisors (see below), whose sum is σ = 50379840. Its totient is φ = 5862912.

The previous prime is 18390431. The next prime is 18390433. The reversal of 18390432 is 23409381.

It is an interprime number because it is at equal distance from previous prime (18390431) and next prime (18390433).

It is a tau number, because it is divible by the number of its divisors (48).

It is a self number, because there is not a number n which added to its sum of digits gives 18390432.

It is not an unprimeable number, because it can be changed into a prime (18390431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1957 + ... + 6372.

It is an arithmetic number, because the mean of its divisors is an integer number (1049580).

Almost surely, 2^18390432 is an apocalyptic number.

18390432 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18390432 is an abundant number, since it is smaller than the sum of its proper divisors (31989408).

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

18390432 is a wasteful number, since it uses less digits than its factorization.

18390432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8365 (or 8357 counting only the distinct ones).

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

The square root of 18390432 is about 4288.4066971312. The cubic root of 18390432 is about 263.9554562129.

The spelling of 18390432 in words is "eighteen million, three hundred ninety thousand, four hundred thirty-two".