404400031 has 8 divisors (see below), whose sum is σ = 464191520. Its totient is φ = 345113568.

The previous prime is 404400023. The next prime is 404400043. The reversal of 404400031 is 130004404.

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 404400031 - 2³ = 404400023 is a prime.

It is a super-2 number, since 2×404400031² = 327078770145601922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 404399978 and 404400014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404400001) 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, 124536 + ... + 127741.

It is an arithmetic number, because the mean of its divisors is an integer number (58023940).

Almost surely, 2^404400031 is an apocalyptic number.

404400031 is a deficient number, since it is larger than the sum of its proper divisors (59791489).

404400031 is a wasteful number, since it uses less digits than its factorization.

404400031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252513.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 404400031 is about 20109.6999231714. The cubic root of 404400031 is about 739.4980958675.

Adding to 404400031 its reverse (130004404), we get a palindrome (534404435).

The spelling of 404400031 in words is "four hundred four million, four hundred thousand, thirty-one".