401531504 has 20 divisors (see below), whose sum is σ = 848691960. Its totient is φ = 182514240.

The previous prime is 401531497. The next prime is 401531509. The reversal of 401531504 is 405135104.

It is a super-2 number, since 2×401531504² = 322455097409004032, 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 401531504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401531509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1140539 + ... + 1140890.

It is an arithmetic number, because the mean of its divisors is an integer number (42434598).

Almost surely, 2^401531504 is an apocalyptic number.

401531504 is a gapful number since it is divisible by the number (44) formed by its first and last digit.

It is an amenable number.

401531504 is an abundant number, since it is smaller than the sum of its proper divisors (447160456).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

401531504 is a wasteful number, since it uses less digits than its factorization.

401531504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2281448 (or 2281442 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 401531504 is about 20038.2510214839. The cubic root of 401531504 is about 737.7454536437.

Adding to 401531504 its reverse (405135104), we get a palindrome (806666608).

The spelling of 401531504 in words is "four hundred one million, five hundred thirty-one thousand, five hundred four".