404518081 has 4 divisors (see below), whose sum is σ = 441292464. Its totient is φ = 367743700.

The previous prime is 404518073. The next prime is 404518097. The reversal of 404518081 is 180815404.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 404518081 - 2³ = 404518073 is a prime.

It is a super-2 number, since 2×404518081² = 327269755711845122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (404518001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18387175 + ... + 18387196.

It is an arithmetic number, because the mean of its divisors is an integer number (110323116).

Almost surely, 2^404518081 is an apocalyptic number.

It is an amenable number.

404518081 is a deficient number, since it is larger than the sum of its proper divisors (36774383).

404518081 is a wasteful number, since it uses less digits than its factorization.

404518081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36774382.

The product of its (nonzero) digits is 5120, while the sum is 31.

The square root of 404518081 is about 20112.6348597095. The cubic root of 404518081 is about 739.5700454640.

The spelling of 404518081 in words is "four hundred four million, five hundred eighteen thousand, eighty-one".