18320472 has 64 divisors (see below), whose sum is σ = 51516000. Its totient is φ = 6031872.

The previous prime is 18320461. The next prime is 18320521. The reversal of 18320472 is 27402381.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18748 + ... + 19700.

Almost surely, 2^18320472 is an apocalyptic number.

18320472 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18320472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25758000).

18320472 is an abundant number, since it is smaller than the sum of its proper divisors (33195528).

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

18320472 is a wasteful number, since it uses less digits than its factorization.

18320472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1057 (or 1047 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 18320472 is about 4280.2420492304. The cubic root of 18320472 is about 263.6203219872.

The spelling of 18320472 in words is "eighteen million, three hundred twenty thousand, four hundred seventy-two".