531322440 has 64 divisors (see below), whose sum is σ = 1738877760. Its totient is φ = 128805120.

The previous prime is 531322439. The next prime is 531322453. The reversal of 531322440 is 44223135.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 531322440.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 199939 + ... + 202578.

It is an arithmetic number, because the mean of its divisors is an integer number (27169965).

Almost surely, 2^531322440 is an apocalyptic number.

It is an amenable number.

531322440 is an abundant number, since it is smaller than the sum of its proper divisors (1207555320).

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

531322440 is a wasteful number, since it uses less digits than its factorization.

531322440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402542 (or 402538 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 24.

The square root of 531322440 is about 23050.4325339027. The cubic root of 531322440 is about 809.9397607998.

Adding to 531322440 its reverse (44223135), we get a palindrome (575545575).

The spelling of 531322440 in words is "five hundred thirty-one million, three hundred twenty-two thousand, four hundred forty".