11656866 has 64 divisors (see below), whose sum is σ = 27216000. Its totient is φ = 3296256.

The previous prime is 11656847. The next prime is 11656867. The reversal of 11656866 is 66865611.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (11656867) 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 31 ways as a sum of consecutive naturals, for example, 78160 + ... + 78308.

It is an arithmetic number, because the mean of its divisors is an integer number (425250).

Almost surely, 2^11656866 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11656866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13608000).

11656866 is an abundant number, since it is smaller than the sum of its proper divisors (15559134).

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

11656866 is a wasteful number, since it uses less digits than its factorization.

11656866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243.

The product of its digits is 51840, while the sum is 39.

The square root of 11656866 is about 3414.2152831947. The cubic root of 11656866 is about 226.7395435599.

The spelling of 11656866 in words is "eleven million, six hundred fifty-six thousand, eight hundred sixty-six".