11520665 has 12 divisors (see below), whose sum is σ = 14923692. Its totient is φ = 8487360.

The previous prime is 11520661. The next prime is 11520667. The reversal of 11520665 is 56602511.

It can be written as a sum of positive squares in 6 ways, for example, as 7974976 + 3545689 = 2824^2 + 1883^2 .

It is not a de Polignac number, because 11520665 - 2² = 11520661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11520661) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27155 + ... + 27575.

It is an arithmetic number, because the mean of its divisors is an integer number (1243641).

Almost surely, 2^11520665 is an apocalyptic number.

It is an amenable number.

11520665 is a deficient number, since it is larger than the sum of its proper divisors (3403027).

11520665 is an frugal number, since it uses more digits than its factorization.

11520665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 860 (or 439 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 11520665 is about 3394.2105120337. The cubic root of 11520665 is about 225.8529926045.

The spelling of 11520665 in words is "eleven million, five hundred twenty thousand, six hundred sixty-five".