18997332 has 24 divisors (see below), whose sum is σ = 44397696. Its totient is φ = 6322368.

The previous prime is 18997331. The next prime is 18997337. The reversal of 18997332 is 23379981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18997331) 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, 13653 + ... + 14979.

It is an arithmetic number, because the mean of its divisors is an integer number (1849904).

Almost surely, 2^18997332 is an apocalyptic number.

18997332 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18997332 is an abundant number, since it is smaller than the sum of its proper divisors (25400364).

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

18997332 is a wasteful number, since it uses less digits than its factorization.

18997332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2527 (or 2525 counting only the distinct ones).

The product of its digits is 81648, while the sum is 42.

The square root of 18997332 is about 4358.5928922073. The cubic root of 18997332 is about 266.8276742953.

The spelling of 18997332 in words is "eighteen million, nine hundred ninety-seven thousand, three hundred thirty-two".