404765881 has 8 divisors (see below), whose sum is σ = 436117640. Its totient is φ = 373444992.

The previous prime is 404765857. The next prime is 404765897. The reversal of 404765881 is 188567404.

It can be written as a sum of positive squares in 4 ways, for example, as 5405625 + 399360256 = 2325^2 + 19984^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 404765881 - 2⁵ = 404765849 is a prime.

It is a super-2 number, since 2×404765881² = 327670836843412322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (404765821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24541 + ... + 37573.

It is an arithmetic number, because the mean of its divisors is an integer number (54514705).

Almost surely, 2^404765881 is an apocalyptic number.

It is an amenable number.

404765881 is a deficient number, since it is larger than the sum of its proper divisors (31351759).

404765881 is a wasteful number, since it uses less digits than its factorization.

404765881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15435.

The product of its (nonzero) digits is 215040, while the sum is 43.

The square root of 404765881 is about 20118.7942233127. The cubic root of 404765881 is about 739.7210301023.

The spelling of 404765881 in words is "four hundred four million, seven hundred sixty-five thousand, eight hundred eighty-one".