18399932 has 6 divisors (see below), whose sum is σ = 32199888. Its totient is φ = 9199964.

The previous prime is 18399919. The next prime is 18399937. The reversal of 18399932 is 23999381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18399937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2299988 + ... + 2299995.

It is an arithmetic number, because the mean of its divisors is an integer number (5366648).

Almost surely, 2^18399932 is an apocalyptic number.

It is an amenable number.

18399932 is a deficient number, since it is larger than the sum of its proper divisors (13799956).

18399932 is a wasteful number, since it uses less digits than its factorization.

18399932 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4599987 (or 4599985 counting only the distinct ones).

The product of its digits is 104976, while the sum is 44.

The square root of 18399932 is about 4289.5141916073. The cubic root of 18399932 is about 264.0008991399. Note that the first 3 decimals are identical.

The spelling of 18399932 in words is "eighteen million, three hundred ninety-nine thousand, nine hundred thirty-two".