18665372 has 48 divisors (see below), whose sum is σ = 38102400. Its totient is φ = 7911360.

The previous prime is 18665369. The next prime is 18665377. The reversal of 18665372 is 27356681.

It is a super-2 number, since 2×18665372² = 696792223796768, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18665377) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69254 + ... + 69522.

It is an arithmetic number, because the mean of its divisors is an integer number (793800).

Almost surely, 2^18665372 is an apocalyptic number.

It is an amenable number.

18665372 is an abundant number, since it is smaller than the sum of its proper divisors (19437028).

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

18665372 is a wasteful number, since it uses less digits than its factorization.

18665372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386 (or 384 counting only the distinct ones).

The product of its digits is 60480, while the sum is 38.

The square root of 18665372 is about 4320.3439677878. The cubic root of 18665372 is about 265.2643475838.

18665372 divided by its sum of digits (38) gives a palindrome (491194).

The spelling of 18665372 in words is "eighteen million, six hundred sixty-five thousand, three hundred seventy-two".