123636120 has 64 divisors (see below), whose sum is σ = 374617440. Its totient is φ = 32643200.

The previous prime is 123636089. The next prime is 123636131. The reversal of 123636120 is 21636321.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1224070 + ... + 1224170.

Almost surely, 2^123636120 is an apocalyptic number.

123636120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123636120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (187308720).

123636120 is an abundant number, since it is smaller than the sum of its proper divisors (250981320).

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

123636120 is an frugal number, since it uses more digits than its factorization.

123636120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317 (or 111 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 123636120 is about 11119.1780271745. The cubic root of 123636120 is about 498.1748390148.

The spelling of 123636120 in words is "one hundred twenty-three million, six hundred thirty-six thousand, one hundred twenty".