404804639 has 2 divisors, whose sum is σ = 404804640. Its totient is φ = 404804638.

The previous prime is 404804597. The next prime is 404804641. The reversal of 404804639 is 936408404.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 404804639 - 2²⁰ = 403756063 is a prime.

Together with 404804641, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (404804689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202402319 + 202402320.

It is an arithmetic number, because the mean of its divisors is an integer number (202402320).

Almost surely, 2^404804639 is an apocalyptic number.

404804639 is a deficient number, since it is larger than the sum of its proper divisors (1).

404804639 is an equidigital number, since it uses as much as digits as its factorization.

404804639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 82944, while the sum is 38.

The square root of 404804639 is about 20119.7574289553. The cubic root of 404804639 is about 739.7446397937.

The spelling of 404804639 in words is "four hundred four million, eight hundred four thousand, six hundred thirty-nine".