11556865 has 8 divisors (see below), whose sum is σ = 13912128. Its totient is φ = 9216240.

The previous prime is 11556859. The next prime is 11556907. The reversal of 11556865 is 56865511.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11556865 - 2⁷ = 11556737 is a prime.

It is a super-2 number, since 2×11556865² = 267122257256450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1837 + ... + 5146.

It is an arithmetic number, because the mean of its divisors is an integer number (1739016).

Almost surely, 2^11556865 is an apocalyptic number.

It is an amenable number.

11556865 is a deficient number, since it is larger than the sum of its proper divisors (2355263).

11556865 is an equidigital number, since it uses as much as digits as its factorization.

11556865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7319.

The product of its digits is 36000, while the sum is 37.

The square root of 11556865 is about 3399.5389393269. The cubic root of 11556865 is about 226.0893021662.

It can be divided in two parts, 11556 and 865, that added together give a palindrome (12421).

The spelling of 11556865 in words is "eleven million, five hundred fifty-six thousand, eight hundred sixty-five".