404990399 has 16 divisors (see below), whose sum is σ = 455486976. Its totient is φ = 356923200.

The previous prime is 404990389. The next prime is 404990441. The reversal of 404990399 is 993099404.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-404990399 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404990329) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51659 + ... + 58979.

It is an arithmetic number, because the mean of its divisors is an integer number (28467936).

Almost surely, 2^404990399 is an apocalyptic number.

404990399 is a deficient number, since it is larger than the sum of its proper divisors (50496577).

404990399 is a wasteful number, since it uses less digits than its factorization.

404990399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7486.

The product of its (nonzero) digits is 314928, while the sum is 47.

The square root of 404990399 is about 20124.3732573216. The cubic root of 404990399 is about 739.8577758080.

The spelling of 404990399 in words is "four hundred four million, nine hundred ninety thousand, three hundred ninety-nine".