404371881 has 9 divisors (see below), whose sum is σ = 584179869. Its totient is φ = 269541036.

The previous prime is 404371873. The next prime is 404371883. The reversal of 404371881 is 188173404.

The square root of 404371881 is 20109.

It is a perfect power (a square), and thus also a powerful number.

404371881 is a `hidden beast` number, since 40 + 437 + 188 + 1 = 666.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 404371881 - 2³ = 404371873 is a prime.

It is a super-2 number, since 2×404371881² = 327033236286956322, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (404371883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 56976 + ... + 63678.

Almost surely, 2^404371881 is an apocalyptic number.

404371881 is the 20109-th square number.

404371881 is the 10055-th centered octagonal number.

It is an amenable number.

404371881 is a deficient number, since it is larger than the sum of its proper divisors (179807988).

404371881 is an frugal number, since it uses more digits than its factorization.

404371881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13412 (or 6706 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The cubic root of 404371881 is about 739.4809368230.

Multiplying 404371881 by its sum of digits (36), we get a square (14557387716 = 120654²).

The spelling of 404371881 in words is "four hundred four million, three hundred seventy-one thousand, eight hundred eighty-one".