204149985 has 32 divisors (see below), whose sum is σ = 353928960. Its totient is φ = 99886848.

The previous prime is 204149977. The next prime is 204150013. The reversal of 204149985 is 589941402.

It is not a de Polignac number, because 204149985 - 2³ = 204149977 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29431 + ... + 35699.

It is an arithmetic number, because the mean of its divisors is an integer number (11060280).

Almost surely, 2^204149985 is an apocalyptic number.

It is an amenable number.

204149985 is a deficient number, since it is larger than the sum of its proper divisors (149778975).

204149985 is a wasteful number, since it uses less digits than its factorization.

204149985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6457.

The product of its (nonzero) digits is 103680, while the sum is 42.

The square root of 204149985 is about 14288.1064175768. The cubic root of 204149985 is about 588.8207653815.

The spelling of 204149985 in words is "two hundred four million, one hundred forty-nine thousand, nine hundred eighty-five".