404865381 has 4 divisors (see below), whose sum is σ = 539820512. Its totient is φ = 269910252.

The previous prime is 404865367. The next prime is 404865403. The reversal of 404865381 is 183568404.

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 not a de Polignac number, because 404865381 - 2²² = 400671077 is a prime.

It is a super-2 number, since 2×404865381² = 327831953464550322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404865311) 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 3 ways as a sum of consecutive naturals, for example, 67477561 + ... + 67477566.

It is an arithmetic number, because the mean of its divisors is an integer number (134955128).

Almost surely, 2^404865381 is an apocalyptic number.

It is an amenable number.

404865381 is a deficient number, since it is larger than the sum of its proper divisors (134955131).

404865381 is a wasteful number, since it uses less digits than its factorization.

404865381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134955130.

The product of its (nonzero) digits is 92160, while the sum is 39.

The square root of 404865381 is about 20121.2668835737. The cubic root of 404865381 is about 739.7816381523.

The spelling of 404865381 in words is "four hundred four million, eight hundred sixty-five thousand, three hundred eighty-one".