204992639 has 2 divisors, whose sum is σ = 204992640. Its totient is φ = 204992638.

The previous prime is 204992573. The next prime is 204992659. The reversal of 204992639 is 936299402.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204992639 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 204992639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204992659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102496319 + 102496320.

It is an arithmetic number, because the mean of its divisors is an integer number (102496320).

Almost surely, 2^204992639 is an apocalyptic number.

204992639 is a deficient number, since it is larger than the sum of its proper divisors (1).

204992639 is an equidigital number, since it uses as much as digits as its factorization.

204992639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 209952, while the sum is 44.

The square root of 204992639 is about 14317.5640036984. The cubic root of 204992639 is about 589.6297964867.

The spelling of 204992639 in words is "two hundred four million, nine hundred ninety-two thousand, six hundred thirty-nine".