111998 has 8 divisors (see below), whose sum is σ = 173880. Its totient is φ = 54040.

The previous prime is 111997. The next prime is 112019. The reversal of 111998 is 899111.

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

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a self number, because there is not a number n which added to its sum of digits gives 111998.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111997) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 908 + ... + 1023.

It is an arithmetic number, because the mean of its divisors is an integer number (21735).

2¹¹¹⁹⁹⁸ is an apocalyptic number.

111998 is a deficient number, since it is larger than the sum of its proper divisors (61882).

111998 is a wasteful number, since it uses less digits than its factorization.

111998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1962.

The product of its digits is 648, while the sum is 29.

The square root of 111998 is about 334.6610225288. The cubic root of 111998 is about 48.2025583601.

The spelling of 111998 in words is "one hundred eleven thousand, nine hundred ninety-eight".