111980 has 24 divisors (see below), whose sum is σ = 257040. Its totient is φ = 40640.

The previous prime is 111977. The next prime is 111997. The reversal of 111980 is 89111.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a nialpdrome in base 7.

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, 35 + ... + 474.

It is an arithmetic number, because the mean of its divisors is an integer number (10710).

2¹¹¹⁹⁸⁰ is an apocalyptic number.

111980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111980 is an abundant number, since it is smaller than the sum of its proper divisors (145060).

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

111980 is a wasteful number, since it uses less digits than its factorization.

111980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 529 (or 527 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 20.

The square root of 111980 is about 334.6341285643. The cubic root of 111980 is about 48.1999758957.

It can be divided in two parts, 11 and 1980, that added together give a palindrome (1991).

The spelling of 111980 in words is "one hundred eleven thousand, nine hundred eighty".