122791920 has 40 divisors (see below), whose sum is σ = 380655696. Its totient is φ = 32744448.

The previous prime is 122791919. The next prime is 122791931. The reversal of 122791920 is 29197221.

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

It is a congruent number.

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, 255577 + ... + 256056.

Almost surely, 2^122791920 is an apocalyptic number.

122791920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

122791920 is an abundant number, since it is smaller than the sum of its proper divisors (257863776).

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

122791920 is a wasteful number, since it uses less digits than its factorization.

122791920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 511649 (or 511643 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 33.

The square root of 122791920 is about 11081.1515647066. The cubic root of 122791920 is about 497.0383856499.

The spelling of 122791920 in words is "one hundred twenty-two million, seven hundred ninety-one thousand, nine hundred twenty".