120921856 has 72 divisors (see below), whose sum is σ = 274909824. Its totient is φ = 52546560.

The previous prime is 120921821. The next prime is 120921881. The reversal of 120921856 is 658129021.

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, 63835 + ... + 65701.

It is an arithmetic number, because the mean of its divisors is an integer number (3818192).

Almost surely, 2^120921856 is an apocalyptic number.

120921856 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 120921856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (137454912).

120921856 is an abundant number, since it is smaller than the sum of its proper divisors (153987968).

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

120921856 is a wasteful number, since it uses less digits than its factorization.

120921856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1917 (or 1903 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 120921856 is about 10996.4474263282. The cubic root of 120921856 is about 494.5022456220.

The spelling of 120921856 in words is "one hundred twenty million, nine hundred twenty-one thousand, eight hundred fifty-six".