123920 has 20 divisors (see below), whose sum is σ = 288300. Its totient is φ = 49536.

The previous prime is 123911. The next prime is 123923. The reversal of 123920 is 29321.

It can be written as a sum of positive squares in 2 ways, for example, as 43264 + 80656 = 208^2 + 284^2 .

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

It is not an unprimeable number, because it can be changed into a prime (123923) by changing a digit.

123920 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 695 + ... + 854.

It is an arithmetic number, because the mean of its divisors is an integer number (14415).

2¹²³⁹²⁰ is an apocalyptic number.

123920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123920 is an abundant number, since it is smaller than the sum of its proper divisors (164380).

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

123920 is a wasteful number, since it uses less digits than its factorization.

123920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1562 (or 1556 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 123920 is about 352.0227265391. The cubic root of 123920 is about 49.8555832778.

The spelling of 123920 in words is "one hundred twenty-three thousand, nine hundred twenty".