11645865 has 48 divisors (see below), whose sum is σ = 25174656. Its totient is φ = 4838400.

The previous prime is 11645857. The next prime is 11645869. The reversal of 11645865 is 56854611.

11645865 is a `hidden beast` number, since 1 + 1 + 645 + 8 + 6 + 5 = 666.

It is not a de Polignac number, because 11645865 - 2³ = 11645857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11645869) 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, 1785 + ... + 5145.

It is an arithmetic number, because the mean of its divisors is an integer number (524472).

Almost surely, 2^11645865 is an apocalyptic number.

11645865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11645865 is an abundant number, since it is smaller than the sum of its proper divisors (13528791).

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

11645865 is a wasteful number, since it uses less digits than its factorization.

11645865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3390 (or 3387 counting only the distinct ones).

The product of its digits is 28800, while the sum is 36.

The square root of 11645865 is about 3412.6038445738. The cubic root of 11645865 is about 226.6681937133.

The spelling of 11645865 in words is "eleven million, six hundred forty-five thousand, eight hundred sixty-five".