204693639 has 8 divisors (see below), whose sum is σ = 276769152. Its totient is φ = 134540280.

The previous prime is 204693581. The next prime is 204693641. The reversal of 204693639 is 936396402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 204693639 - 2⁸ = 204693383 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 204693639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204693649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 480289 + ... + 480714.

It is an arithmetic number, because the mean of its divisors is an integer number (34596144).

Almost surely, 2^204693639 is an apocalyptic number.

204693639 is a deficient number, since it is larger than the sum of its proper divisors (72075513).

204693639 is an equidigital number, since it uses as much as digits as its factorization.

204693639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 961077.

The product of its (nonzero) digits is 209952, while the sum is 42.

The square root of 204693639 is about 14307.1184729840. The cubic root of 204693639 is about 589.3429811559.

The spelling of 204693639 in words is "two hundred four million, six hundred ninety-three thousand, six hundred thirty-nine".