123912 has 24 divisors (see below), whose sum is σ = 335790. Its totient is φ = 41280.

The previous prime is 123911. The next prime is 123923. The reversal of 123912 is 219321.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 93636 + 30276 = 306^2 + 174^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nude number because it is divisible by every one of its digits.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (123911) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 789 + ... + 932.

2¹²³⁹¹² is an apocalyptic number.

123912 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

123912 is an abundant number, since it is smaller than the sum of its proper divisors (211878).

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

123912 is a wasteful number, since it uses less digits than its factorization.

123912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1733 (or 1726 counting only the distinct ones).

The product of its digits is 108, while the sum is 18.

The square root of 123912 is about 352.0113634529. The cubic root of 123912 is about 49.8545103995.

It can be divided in two parts, 123 and 912, that added together give a triangular number (1035 = T₄₅).

The spelling of 123912 in words is "one hundred twenty-three thousand, nine hundred twelve".