804639239 has 2 divisors, whose sum is σ = 804639240. Its totient is φ = 804639238.

The previous prime is 804639181. The next prime is 804639281. The reversal of 804639239 is 932936408.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-804639239 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 804639239.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (804639289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 402319619 + 402319620.

It is an arithmetic number, because the mean of its divisors is an integer number (402319620).

Almost surely, 2^804639239 is an apocalyptic number.

804639239 is a deficient number, since it is larger than the sum of its proper divisors (1).

804639239 is an equidigital number, since it uses as much as digits as its factorization.

804639239 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 279936, while the sum is 44.

The square root of 804639239 is about 28366.1636285205. The cubic root of 804639239 is about 930.1087624754.

The spelling of 804639239 in words is "eight hundred four million, six hundred thirty-nine thousand, two hundred thirty-nine".