11909988 has 36 divisors (see below), whose sum is σ = 30750720. Its totient is φ = 3884976.

The previous prime is 11909971. The next prime is 11909999. The reversal of 11909988 is 88990911.

It is a tau number, because it is divible by the number of its divisors (36).

It is a zygodrome in base 8.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1828 + ... + 5211.

Almost surely, 2^11909988 is an apocalyptic number.

11909988 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

11909988 is an abundant number, since it is smaller than the sum of its proper divisors (18840732).

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

11909988 is a wasteful number, since it uses less digits than its factorization.

11909988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7096 (or 7091 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 45.

The square root of 11909988 is about 3451.0850467643. The cubic root of 11909988 is about 228.3689778063.

The spelling of 11909988 in words is "eleven million, nine hundred nine thousand, nine hundred eighty-eight".