11198988 has 72 divisors (see below), whose sum is σ = 31056480. Its totient is φ = 3386880.

The previous prime is 11198969. The next prime is 11199007. The reversal of 11198988 is 88989111.

It is an interprime number because it is at equal distance from previous prime (11198969) and next prime (11199007).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17433 + ... + 18063.

It is an arithmetic number, because the mean of its divisors is an integer number (431340).

Almost surely, 2^11198988 is an apocalyptic number.

11198988 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11198988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15528240).

11198988 is an abundant number, since it is smaller than the sum of its proper divisors (19857492).

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

11198988 is a wasteful number, since it uses less digits than its factorization.

11198988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 687 (or 682 counting only the distinct ones).

The product of its digits is 41472, while the sum is 45.

The square root of 11198988 is about 3346.4889063016. The cubic root of 11198988 is about 223.7310494442.

It can be divided in two parts, 111 and 98988, that added together give a palindrome (99099).

The spelling of 11198988 in words is "eleven million, one hundred ninety-eight thousand, nine hundred eighty-eight".