624431421 has 12 divisors (see below), whose sum is σ = 902272800. Its totient is φ = 416141640.

The previous prime is 624431413. The next prime is 624431459. The reversal of 624431421 is 124134426.

It is a happy number.

624431421 is a `hidden beast` number, since 624 + 4 + 3 + 14 + 21 = 666.

It is not a de Polignac number, because 624431421 - 2³ = 624431413 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (624432421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19176 + ... + 40206.

It is an arithmetic number, because the mean of its divisors is an integer number (75189400).

Almost surely, 2^624431421 is an apocalyptic number.

It is an amenable number.

624431421 is a deficient number, since it is larger than the sum of its proper divisors (277841379).

624431421 is a wasteful number, since it uses less digits than its factorization.

624431421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24336 (or 24333 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

The square root of 624431421 is about 24988.6258325663. The cubic root of 624431421 is about 854.7286263005.

Adding to 624431421 its reverse (124134426), we get a palindrome (748565847).

The spelling of 624431421 in words is "six hundred twenty-four million, four hundred thirty-one thousand, four hundred twenty-one".