123113720 has 32 divisors (see below), whose sum is σ = 278622720. Its totient is φ = 48958080.

The previous prime is 123113717. The next prime is 123113759. The reversal of 123113720 is 27311321.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 123113692 and 123113701.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1976 + ... + 15815.

It is an arithmetic number, because the mean of its divisors is an integer number (8706960).

Almost surely, 2^123113720 is an apocalyptic number.

123113720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123113720 is an abundant number, since it is smaller than the sum of its proper divisors (155509000).

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

123113720 is a wasteful number, since it uses less digits than its factorization.

123113720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17975 (or 17971 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 123113720 is about 11095.6622154786. The cubic root of 123113720 is about 497.4722020107.

The spelling of 123113720 in words is "one hundred twenty-three million, one hundred thirteen thousand, seven hundred twenty".