401405504 has 14 divisors (see below), whose sum is σ = 796539174. Its totient is φ = 200702720.

The previous prime is 401405483. The next prime is 401405561. The reversal of 401405504 is 405504104.

It can be written as a sum of positive squares in only one way, i.e., 329495104 + 71910400 = 18152^2 + 8480^2 .

It is a super-2 number, since 2×401405504² = 322252757282988032, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 401405504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3135917 + ... + 3136044.

Almost surely, 2^401405504 is an apocalyptic number.

It is an amenable number.

401405504 is a deficient number, since it is larger than the sum of its proper divisors (395133670).

401405504 is an equidigital number, since it uses as much as digits as its factorization.

401405504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6271973 (or 6271963 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 401405504 is about 20035.1067878362. The cubic root of 401405504 is about 737.6682777550.

Adding to 401405504 its reverse (405504104), we get a palindrome (806909608).

The spelling of 401405504 in words is "four hundred one million, four hundred five thousand, five hundred four".