404839685 has 8 divisors (see below), whose sum is σ = 490816536. Its totient is φ = 320532480.

The previous prime is 404839679. The next prime is 404839693. The reversal of 404839685 is 586938404.

It can be written as a sum of positive squares in 4 ways, for example, as 306916 + 404532769 = 554^2 + 20113^2 .

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

It is not a de Polignac number, because 404839685 - 2⁸ = 404839429 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 416876 + ... + 417845.

It is an arithmetic number, because the mean of its divisors is an integer number (61352067).

Almost surely, 2^404839685 is an apocalyptic number.

It is an amenable number.

404839685 is a deficient number, since it is larger than the sum of its proper divisors (85976851).

404839685 is an equidigital number, since it uses as much as digits as its factorization.

404839685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 834823.

The product of its (nonzero) digits is 829440, while the sum is 47.

The square root of 404839685 is about 20120.6283450592. The cubic root of 404839685 is about 739.7659869984.

The spelling of 404839685 in words is "four hundred four million, eight hundred thirty-nine thousand, six hundred eighty-five".