111989998 has 8 divisors (see below), whose sum is σ = 168134400. Its totient is φ = 55945200.

The previous prime is 111989963. The next prime is 111990001. The reversal of 111989998 is 899989111.

It is a sphenic number, since it is the product of 3 distinct primes.

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, 22023 + ... + 26626.

It is an arithmetic number, because the mean of its divisors is an integer number (21016800).

Almost surely, 2^111989998 is an apocalyptic number.

111989998 is a deficient number, since it is larger than the sum of its proper divisors (56144402).

111989998 is a wasteful number, since it uses less digits than its factorization.

111989998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49802.

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

The square root of 111989998 is about 10582.5326836254. The cubic root of 111989998 is about 482.0141034538.

The spelling of 111989998 in words is "one hundred eleven million, nine hundred eighty-nine thousand, nine hundred ninety-eight".