123399936 has 180 divisors, whose sum is σ = 402148824. Its totient is φ = 37324800.

The previous prime is 123399893. The next prime is 123399961. The reversal of 123399936 is 639993321.

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

It is a junction number, because it is equal to n+sod(n) for n = 123399891 and 123399900.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 227826 + ... + 228366.

Almost surely, 2^123399936 is an apocalyptic number.

123399936 is a gapful number since it is divisible by the number (16) 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 123399936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (201074412).

123399936 is an abundant number, since it is smaller than the sum of its proper divisors (278748888).

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

123399936 is an equidigital number, since it uses as much as digits as its factorization.

123399936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 580 (or 557 counting only the distinct ones).

The product of its digits is 236196, while the sum is 45.

The square root of 123399936 is about 11108.5523809361. The cubic root of 123399936 is about 497.8574130906.

The spelling of 123399936 in words is "one hundred twenty-three million, three hundred ninety-nine thousand, nine hundred thirty-six".