18321372 has 36 divisors (see below), whose sum is σ = 47809216. Its totient is φ = 5909760.

The previous prime is 18321371. The next prime is 18321389. The reversal of 18321372 is 27312381.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18321371) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7093 + ... + 9324.

Almost surely, 2^18321372 is an apocalyptic number.

18321372 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18321372 is an abundant number, since it is smaller than the sum of its proper divisors (29487844).

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

18321372 is a wasteful number, since it uses less digits than its factorization.

18321372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16458 (or 16453 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 18321372 is about 4280.3471821804. The cubic root of 18321372 is about 263.6246387320.

The spelling of 18321372 in words is "eighteen million, three hundred twenty-one thousand, three hundred seventy-two".