18663372 has 144 divisors (see below), whose sum is σ = 60499712. Its totient is φ = 4898880.

The previous prime is 18663353. The next prime is 18663409. The reversal of 18663372 is 27336681.

It is a happy number.

18663372 is a `hidden beast` number, since 18 + 6 + 633 + 7 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 88347 + ... + 88557.

Almost surely, 2^18663372 is an apocalyptic number.

18663372 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 18663372, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30249856).

18663372 is an abundant number, since it is smaller than the sum of its proper divisors (41836340).

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

18663372 is a wasteful number, since it uses less digits than its factorization.

18663372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250 (or 236 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 18663372 is about 4320.1124985352. The cubic root of 18663372 is about 265.2548728615.

The spelling of 18663372 in words is "eighteen million, six hundred sixty-three thousand, three hundred seventy-two".