204139878 has 32 divisors (see below), whose sum is σ = 422057184. Its totient is φ = 65774592.

The previous prime is 204139849. The next prime is 204139883. The reversal of 204139878 is 878931402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31926 + ... + 37782.

It is an arithmetic number, because the mean of its divisors is an integer number (13189287).

Almost surely, 2^204139878 is an apocalyptic number.

204139878 is an abundant number, since it is smaller than the sum of its proper divisors (217917306).

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

204139878 is a wasteful number, since it uses less digits than its factorization.

204139878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6056.

The product of its (nonzero) digits is 96768, while the sum is 42.

The square root of 204139878 is about 14287.7527274236. The cubic root of 204139878 is about 588.8110481636.

The spelling of 204139878 in words is "two hundred four million, one hundred thirty-nine thousand, eight hundred seventy-eight".