531921400 has 24 divisors (see below), whose sum is σ = 1236717720. Its totient is φ = 212768480.

The previous prime is 531921389. The next prime is 531921427. The reversal of 531921400 is 4129135.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1329604 + ... + 1330003.

It is an arithmetic number, because the mean of its divisors is an integer number (51529905).

Almost surely, 2^531921400 is an apocalyptic number.

531921400 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

531921400 is an abundant number, since it is smaller than the sum of its proper divisors (704796320).

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

531921400 is a wasteful number, since it uses less digits than its factorization.

531921400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2659623 (or 2659614 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 531921400 is about 23063.4212553125. The cubic root of 531921400 is about 810.2439949799.

The spelling of 531921400 in words is "five hundred thirty-one million, nine hundred twenty-one thousand, four hundred".