31223402430 has 128 divisors (see below), whose sum is σ = 88827494400. Its totient is φ = 6939561600.

The previous prime is 31223402429. The next prime is 31223402447. The reversal of 31223402430 is 3420432213.

It is a self number, because there is not a number n which added to its sum of digits gives 31223402430.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 114051 + ... + 274689.

It is an arithmetic number, because the mean of its divisors is an integer number (693964800).

Almost surely, 2^31223402430 is an apocalyptic number.

31223402430 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 31223402430, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44413747200).

31223402430 is an abundant number, since it is smaller than the sum of its proper divisors (57604091970).

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

31223402430 is a wasteful number, since it uses less digits than its factorization.

31223402430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160710.

The product of its (nonzero) digits is 3456, while the sum is 24.

Adding to 31223402430 its reverse (3420432213), we get a palindrome (34643834643).

The spelling of 31223402430 in words is "thirty-one billion, two hundred twenty-three million, four hundred two thousand, four hundred thirty".