11918988 has 30 divisors (see below), whose sum is σ = 31159436. Its totient is φ = 3972888.

The previous prime is 11918981. The next prime is 11918993. The reversal of 11918988 is 88981911.

It is not an unprimeable number, because it can be changed into a prime (11918981) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 18070 + ... + 18717.

Almost surely, 2^11918988 is an apocalyptic number.

11918988 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

11918988 is an abundant number, since it is smaller than the sum of its proper divisors (19240448).

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

11918988 is a wasteful number, since it uses less digits than its factorization.

11918988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36803 (or 36792 counting only the distinct ones).

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

The square root of 11918988 is about 3452.3887382507. The cubic root of 11918988 is about 228.4264870527.

The spelling of 11918988 in words is "eleven million, nine hundred eighteen thousand, nine hundred eighty-eight".