122831920 has 40 divisors (see below), whose sum is σ = 294802560. Its totient is φ = 47546880.

The previous prime is 122831893. The next prime is 122831921. The reversal of 122831920 is 29138221.

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

It is not an unprimeable number, because it can be changed into a prime (122831921) 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, 22285 + ... + 27244.

It is an arithmetic number, because the mean of its divisors is an integer number (7370064).

Almost surely, 2^122831920 is an apocalyptic number.

122831920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

122831920 is an abundant number, since it is smaller than the sum of its proper divisors (171970640).

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

122831920 is a wasteful number, since it uses less digits than its factorization.

122831920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49573 (or 49567 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 122831920 is about 11082.9562843133. The cubic root of 122831920 is about 497.0923505932.

The spelling of 122831920 in words is "one hundred twenty-two million, eight hundred thirty-one thousand, nine hundred twenty".