18400332 has 24 divisors (see below), whose sum is σ = 43353856. Its totient is φ = 6073488.

The previous prime is 18400313. The next prime is 18400351. The reversal of 18400332 is 23300481.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18400313) and next prime (18400351).

It is a junction number, because it is equal to n+sod(n) for n = 18400299 and 18400308.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6208 + ... + 8679.

Almost surely, 2^18400332 is an apocalyptic number.

18400332 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18400332 is an abundant number, since it is smaller than the sum of its proper divisors (24953524).

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

18400332 is a wasteful number, since it uses less digits than its factorization.

18400332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14997 (or 14995 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 18400332 is about 4289.5608166804. The cubic root of 18400332 is about 264.0028121831.

The spelling of 18400332 in words is "eighteen million, four hundred thousand, three hundred thirty-two".