123931931620 has 48 divisors (see below), whose sum is σ = 297469105920. Its totient is φ = 42486309504.

The previous prime is 123931931609. The next prime is 123931931621. The reversal of 123931931620 is 26139139321.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (123931931621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1391386 + ... + 1477774.

It is an arithmetic number, because the mean of its divisors is an integer number (6197273040).

Almost surely, 2^123931931620 is an apocalyptic number.

123931931620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123931931620 is an abundant number, since it is smaller than the sum of its proper divisors (173537174300).

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

123931931620 is a wasteful number, since it uses less digits than its factorization.

123931931620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96652 (or 96650 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 40.

The spelling of 123931931620 in words is "one hundred twenty-three billion, nine hundred thirty-one million, nine hundred thirty-one thousand, six hundred twenty".