11666889 has 32 divisors (see below), whose sum is σ = 19071360. Its totient is φ = 7003584.

The previous prime is 11666873. The next prime is 11666923. The reversal of 11666889 is 98866611.

It is a happy number.

It is not a de Polignac number, because 11666889 - 2⁴ = 11666873 is a prime.

It is a super-2 number, since 2×11666889² = 272232597876642, which contains 22 as substring.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (11666689) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14707 + ... + 15479.

It is an arithmetic number, because the mean of its divisors is an integer number (595980).

Almost surely, 2^11666889 is an apocalyptic number.

It is an amenable number.

11666889 is a deficient number, since it is larger than the sum of its proper divisors (7404471).

11666889 is a wasteful number, since it uses less digits than its factorization.

11666889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 838 (or 832 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The square root of 11666889 is about 3415.6828014322. The cubic root of 11666889 is about 226.8045112621.

The spelling of 11666889 in words is "eleven million, six hundred sixty-six thousand, eight hundred eighty-nine".