120991140 has 72 divisors (see below), whose sum is σ = 378862848. Its totient is φ = 31222080.

The previous prime is 120991133. The next prime is 120991141. The reversal of 120991140 is 41199021.

It is not an unprimeable number, because it can be changed into a prime (120991141) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5262 + ... + 16421.

It is an arithmetic number, because the mean of its divisors is an integer number (5261984).

Almost surely, 2^120991140 is an apocalyptic number.

120991140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

120991140 is an abundant number, since it is smaller than the sum of its proper divisors (257871708).

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

120991140 is a wasteful number, since it uses less digits than its factorization.

120991140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21729 (or 21724 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The square root of 120991140 is about 10999.5972653548. The cubic root of 120991140 is about 494.5966717617.

The spelling of 120991140 in words is "one hundred twenty million, nine hundred ninety-one thousand, one hundred forty".