204400642 has 16 divisors (see below), whose sum is σ = 317520000. Its totient is φ = 98568400.

The previous prime is 204400633. The next prime is 204400667. The reversal of 204400642 is 246004402.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 85767 + ... + 88117.

It is an arithmetic number, because the mean of its divisors is an integer number (19845000).

Almost surely, 2^204400642 is an apocalyptic number.

204400642 is a deficient number, since it is larger than the sum of its proper divisors (113119358).

204400642 is a wasteful number, since it uses less digits than its factorization.

204400642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3881.

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 204400642 is about 14296.8752530055. The cubic root of 204400642 is about 589.0616531172.

The spelling of 204400642 in words is "two hundred four million, four hundred thousand, six hundred forty-two".