120991800 has 48 divisors (see below), whose sum is σ = 375076440. Its totient is φ = 32264320.

The previous prime is 120991781. The next prime is 120991811. The reversal of 120991800 is 8199021.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 100227 + ... + 101426.

Almost surely, 2^120991800 is an apocalyptic number.

120991800 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

120991800 is an abundant number, since it is smaller than the sum of its proper divisors (254084640).

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

120991800 is a wasteful number, since it uses less digits than its factorization.

120991800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201672 (or 201663 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 30.

The square root of 120991800 is about 10999.6272664123. The cubic root of 120991800 is about 494.5975710926.

The spelling of 120991800 in words is "one hundred twenty million, nine hundred ninety-one thousand, eight hundred".