11717988 has 24 divisors (see below), whose sum is σ = 27626592. Its totient is φ = 3865344.

The previous prime is 11717983. The next prime is 11717989. The reversal of 11717988 is 88971711.

It is a happy number.

11717988 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×11717988² = 274622485536288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11717983) 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, 3870 + ... + 6197.

It is an arithmetic number, because the mean of its divisors is an integer number (1151108).

Almost surely, 2^11717988 is an apocalyptic number.

It is an amenable number.

11717988 is an abundant number, since it is smaller than the sum of its proper divisors (15908604).

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

11717988 is a wasteful number, since it uses less digits than its factorization.

11717988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10171 (or 10169 counting only the distinct ones).

The product of its digits is 28224, while the sum is 42.

The square root of 11717988 is about 3423.1546853743. The cubic root of 11717988 is about 227.1351508119.

The spelling of 11717988 in words is "eleven million, seven hundred seventeen thousand, nine hundred eighty-eight".