123711920 has 20 divisors (see below), whose sum is σ = 287630400. Its totient is φ = 49484736.

The previous prime is 123711901. The next prime is 123711923. The reversal of 123711920 is 29117321.

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 123711920.

It is not an unprimeable number, because it can be changed into a prime (123711923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 773120 + ... + 773279.

It is an arithmetic number, because the mean of its divisors is an integer number (14381520).

Almost surely, 2^123711920 is an apocalyptic number.

123711920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123711920 is an abundant number, since it is smaller than the sum of its proper divisors (163918480).

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

123711920 is a wasteful number, since it uses less digits than its factorization.

123711920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1546412 (or 1546406 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 26.

The square root of 123711920 is about 11122.5860302360. The cubic root of 123711920 is about 498.2766267942.

The spelling of 123711920 in words is "one hundred twenty-three million, seven hundred eleven thousand, nine hundred twenty".