11989656 has 48 divisors (see below), whose sum is σ = 37112400. Its totient is φ = 3425472.

The previous prime is 11989597. The next prime is 11989657. The reversal of 11989656 is 65698911.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11989657) 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 11 ways as a sum of consecutive naturals, for example, 11391 + ... + 12398.

It is an arithmetic number, because the mean of its divisors is an integer number (773175).

Almost surely, 2^11989656 is an apocalyptic number.

It is an amenable number.

11989656 is an abundant number, since it is smaller than the sum of its proper divisors (25122744).

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

11989656 is a wasteful number, since it uses less digits than its factorization.

11989656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23808 (or 23801 counting only the distinct ones).

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

The square root of 11989656 is about 3462.6082654554. The cubic root of 11989656 is about 228.8770466882.

It can be divided in two parts, 119896 and 56, that multiplied together give a palindrome (6714176).

The spelling of 11989656 in words is "eleven million, nine hundred eighty-nine thousand, six hundred fifty-six".