111999988 has 12 divisors (see below), whose sum is σ = 196222432. Its totient is φ = 55936440.

The previous prime is 111999977. The next prime is 111999991. The reversal of 111999988 is 889999111.

It is a zygodrome in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11808 + ... + 19063.

Almost surely, 2^111999988 is an apocalyptic number.

It is an amenable number.

111999988 is a deficient number, since it is larger than the sum of its proper divisors (84222444).

111999988 is a wasteful number, since it uses less digits than its factorization.

111999988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31782 (or 31780 counting only the distinct ones).

The product of its digits is 419904, while the sum is 55.

The square root of 111999988 is about 10583.0046773116. The cubic root of 111999988 is about 482.0284356197.

The spelling of 111999988 in words is "one hundred eleven million, nine hundred ninety-nine thousand, nine hundred eighty-eight".