11989665 has 48 divisors (see below), whose sum is σ = 22526400. Its totient is φ = 5878656.

The previous prime is 11989657. The next prime is 11989669. The reversal of 11989665 is 56698911.

It is not a de Polignac number, because 11989665 - 2³ = 11989657 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 11989665.

It is not an unprimeable number, because it can be changed into a prime (11989669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 31446 + ... + 31824.

It is an arithmetic number, because the mean of its divisors is an integer number (469300).

Almost surely, 2^11989665 is an apocalyptic number.

11989665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11989665 is a deficient number, since it is larger than the sum of its proper divisors (10536735).

11989665 is a wasteful number, since it uses less digits than its factorization.

11989665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 446 (or 443 counting only the distinct ones).

The product of its digits is 116640, while the sum is 45.

The square root of 11989665 is about 3462.6095650535. The cubic root of 11989665 is about 228.8771039568.

The spelling of 11989665 in words is "eleven million, nine hundred eighty-nine thousand, six hundred sixty-five".