404163665 has 12 divisors (see below), whose sum is σ = 496549044. Its totient is φ = 315804384.

The previous prime is 404163619. The next prime is 404163667. The reversal of 404163665 is 566361404.

It can be written as a sum of positive squares in 2 ways, for example, as 313856656 + 90307009 = 17716^2 + 9503^2 .

It is not a de Polignac number, because 404163665 - 2⁶ = 404163601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (404163667) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 12614 + ... + 31103.

It is an arithmetic number, because the mean of its divisors is an integer number (41379087).

Almost surely, 2^404163665 is an apocalyptic number.

It is an amenable number.

404163665 is a deficient number, since it is larger than the sum of its proper divisors (92385379).

404163665 is an equidigital number, since it uses as much as digits as its factorization.

404163665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43808 (or 43765 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 35.

The square root of 404163665 is about 20103.8221490342. The cubic root of 404163665 is about 739.3539924558.

The spelling of 404163665 in words is "four hundred four million, one hundred sixty-three thousand, six hundred sixty-five".