11817988 has 24 divisors (see below), whose sum is σ = 25454912. Its totient is φ = 4675104.

The previous prime is 11817983. The next prime is 11817997. The reversal of 11817988 is 88971811.

It is not an unprimeable number, because it can be changed into a prime (11817983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15870 + ... + 16597.

Almost surely, 2^11817988 is an apocalyptic number.

It is an amenable number.

11817988 is an abundant number, since it is smaller than the sum of its proper divisors (13636924).

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

11817988 is a wasteful number, since it uses less digits than its factorization.

11817988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32491 (or 32489 counting only the distinct ones).

The product of its digits is 32256, while the sum is 43.

The square root of 11817988 is about 3437.7300650284. The cubic root of 11817988 is about 227.7794368487.

The spelling of 11817988 in words is "eleven million, eight hundred seventeen thousand, nine hundred eighty-eight".