18387372 has 24 divisors (see below), whose sum is σ = 44064496. Its totient is φ = 5963328.

The previous prime is 18387361. The next prime is 18387377. The reversal of 18387372 is 27378381.

It is a self number, because there is not a number n which added to its sum of digits gives 18387372.

It is not an unprimeable number, because it can be changed into a prime (18387377) 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, 20263 + ... + 21150.

Almost surely, 2^18387372 is an apocalyptic number.

18387372 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18387372 is an abundant number, since it is smaller than the sum of its proper divisors (25677124).

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

18387372 is a wasteful number, since it uses less digits than its factorization.

18387372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41457 (or 41455 counting only the distinct ones).

The product of its digits is 56448, while the sum is 39.

The square root of 18387372 is about 4288.0499064260. The cubic root of 18387372 is about 263.9408154747.

The spelling of 18387372 in words is "eighteen million, three hundred eighty-seven thousand, three hundred seventy-two".