204638990 has 32 divisors (see below), whose sum is σ = 374353056. Its totient is φ = 80530560.

The previous prime is 204638953. The next prime is 204638999. The reversal of 204638990 is 99836402.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204638999) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 309260 + ... + 309920.

It is an arithmetic number, because the mean of its divisors is an integer number (11698533).

Almost surely, 2^204638990 is an apocalyptic number.

204638990 is a deficient number, since it is larger than the sum of its proper divisors (169714066).

204638990 is a wasteful number, since it uses less digits than its factorization.

204638990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1124.

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 204638990 is about 14305.2084920144. The cubic root of 204638990 is about 589.2905289947.

The spelling of 204638990 in words is "two hundred four million, six hundred thirty-eight thousand, nine hundred ninety".