123899920 has 40 divisors (see below), whose sum is σ = 288999360. Its totient is φ = 49399680.

The previous prime is 123899917. The next prime is 123899933. The reversal of 123899920 is 29998321.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24141 + ... + 28819.

It is an arithmetic number, because the mean of its divisors is an integer number (7224984).

Almost surely, 2^123899920 is an apocalyptic number.

123899920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123899920 is an abundant number, since it is smaller than the sum of its proper divisors (165099440).

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

123899920 is a wasteful number, since it uses less digits than its factorization.

123899920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5023 (or 5017 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 43.

The square root of 123899920 is about 11131.0340939196. The cubic root of 123899920 is about 498.5289026567.

The spelling of 123899920 in words is "one hundred twenty-three million, eight hundred ninety-nine thousand, nine hundred twenty".