404518939 has 4 divisors (see below), whose sum is σ = 441293400. Its totient is φ = 367744480.

The previous prime is 404518937. The next prime is 404518943. The reversal of 404518939 is 939815404.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 404518939 - 2¹ = 404518937 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 404518895 and 404518904.

It is not an unprimeable number, because it can be changed into a prime (404518937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18387214 + ... + 18387235.

It is an arithmetic number, because the mean of its divisors is an integer number (110323350).

Almost surely, 2^404518939 is an apocalyptic number.

404518939 is a deficient number, since it is larger than the sum of its proper divisors (36774461).

404518939 is a wasteful number, since it uses less digits than its factorization.

404518939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36774460.

The product of its (nonzero) digits is 155520, while the sum is 43.

The square root of 404518939 is about 20112.6561895738. The cubic root of 404518939 is about 739.5705683501.

The spelling of 404518939 in words is "four hundred four million, five hundred eighteen thousand, nine hundred thirty-nine".