18399204 has 24 divisors (see below), whose sum is σ = 47701920. Its totient is φ = 6133032.

The previous prime is 18399203. The next prime is 18399223. The reversal of 18399204 is 40299381.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (18399203) 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, 85074 + ... + 85289.

It is an arithmetic number, because the mean of its divisors is an integer number (1987580).

Almost surely, 2^18399204 is an apocalyptic number.

It is an amenable number.

18399204 is an abundant number, since it is smaller than the sum of its proper divisors (29302716).

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

18399204 is a wasteful number, since it uses less digits than its factorization.

18399204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170376 (or 170368 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 18399204 is about 4289.4293326735. The cubic root of 18399204 is about 263.9974173301.

The spelling of 18399204 in words is "eighteen million, three hundred ninety-nine thousand, two hundred four".