120817980 has 240 divisors, whose sum is σ = 414935136. Its totient is φ = 29306880.

The previous prime is 120817909. The next prime is 120818023. The reversal of 120817980 is 89718021.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1129087 + ... + 1129193.

Almost surely, 2^120817980 is an apocalyptic number.

120817980 is a gapful number since it is divisible by the number (10) 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 120817980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (207467568).

120817980 is an abundant number, since it is smaller than the sum of its proper divisors (294117156).

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

120817980 is a wasteful number, since it uses less digits than its factorization.

120817980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186 (or 175 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 36.

The square root of 120817980 is about 10991.7232497912. The cubic root of 120817980 is about 494.3606069565.

The spelling of 120817980 in words is "one hundred twenty million, eight hundred seventeen thousand, nine hundred eighty".