531400440 has 32 divisors (see below), whose sum is σ = 1594201680. Its totient is φ = 141706752.

The previous prime is 531400427. The next prime is 531400447. The reversal of 531400440 is 44004135.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531400447) 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 7 ways as a sum of consecutive naturals, for example, 2214049 + ... + 2214288.

Almost surely, 2^531400440 is an apocalyptic number.

It is an amenable number.

531400440 is an abundant number, since it is smaller than the sum of its proper divisors (1062801240).

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

531400440 is a wasteful number, since it uses less digits than its factorization.

531400440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4428351 (or 4428347 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 531400440 is about 23052.1244140318. The cubic root of 531400440 is about 809.9793928609.

Adding to 531400440 its reverse (44004135), we get a palindrome (575404575).

The spelling of 531400440 in words is "five hundred thirty-one million, four hundred thousand, four hundred forty".