204999957 has 32 divisors (see below), whose sum is σ = 325503360. Its totient is φ = 127054080.

The previous prime is 204999937. The next prime is 204999997. The reversal of 204999957 is 759999402.

It is not a de Polignac number, because 204999957 - 2⁷ = 204999829 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204999937) 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 in 31 ways as a sum of consecutive naturals, for example, 35407 + ... + 40787.

It is an arithmetic number, because the mean of its divisors is an integer number (10171980).

Almost surely, 2^204999957 is an apocalyptic number.

204999957 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

204999957 is a deficient number, since it is larger than the sum of its proper divisors (120503403).

204999957 is a wasteful number, since it uses less digits than its factorization.

204999957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5490 (or 5484 counting only the distinct ones).

The product of its (nonzero) digits is 1837080, while the sum is 54.

The square root of 204999957 is about 14317.8195616511. The cubic root of 204999957 is about 589.6368127704.

The spelling of 204999957 in words is "two hundred four million, nine hundred ninety-nine thousand, nine hundred fifty-seven".