123129936 has 40 divisors (see below), whose sum is σ = 353429760. Its totient is φ = 41043168.

The previous prime is 123129931. The next prime is 123129959. The reversal of 123129936 is 639921321.

It is a happy number.

It is a super-2 number, since 2×123129936² = 30321962278728192, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

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

It is a self number, because there is not a number n which added to its sum of digits gives 123129936.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123129931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 142080 + ... + 142943.

It is an arithmetic number, because the mean of its divisors is an integer number (8835744).

Almost surely, 2^123129936 is an apocalyptic number.

123129936 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

123129936 is an abundant number, since it is smaller than the sum of its proper divisors (230299824).

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

123129936 is a wasteful number, since it uses less digits than its factorization.

123129936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285040 (or 285028 counting only the distinct ones).

The product of its digits is 17496, while the sum is 36.

The square root of 123129936 is about 11096.3929274337. The cubic root of 123129936 is about 497.4940426717.

The spelling of 123129936 in words is "one hundred twenty-three million, one hundred twenty-nine thousand, nine hundred thirty-six".