111987992 has 16 divisors (see below), whose sum is σ = 212058000. Its totient is φ = 55439200.

The previous prime is 111987979. The next prime is 111988003. The reversal of 111987992 is 299789111.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68492 + ... + 70107.

It is an arithmetic number, because the mean of its divisors is an integer number (13253625).

Almost surely, 2^111987992 is an apocalyptic number.

It is an amenable number.

111987992 is a deficient number, since it is larger than the sum of its proper divisors (100070008).

111987992 is a wasteful number, since it uses less digits than its factorization.

111987992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138706 (or 138702 counting only the distinct ones).

The product of its digits is 81648, while the sum is 47.

The square root of 111987992 is about 10582.4379043772. The cubic root of 111987992 is about 482.0112254406.

The spelling of 111987992 in words is "one hundred eleven million, nine hundred eighty-seven thousand, nine hundred ninety-two".