404818816 has 16 divisors (see below), whose sum is σ = 806475240. Its totient is φ = 202409344.

The previous prime is 404818787. The next prime is 404818819. The reversal of 404818816 is 618818404.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404818819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1581196 + ... + 1581451.

Almost surely, 2^404818816 is an apocalyptic number.

It is an amenable number.

404818816 is a deficient number, since it is larger than the sum of its proper divisors (401656424).

404818816 is an equidigital number, since it uses as much as digits as its factorization.

404818816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3162661 (or 3162649 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 40.

The square root of 404818816 is about 20120.1097412514. The cubic root of 404818816 is about 739.7532754303.

The spelling of 404818816 in words is "four hundred four million, eight hundred eighteen thousand, eight hundred sixteen".