11563965 has 40 divisors (see below), whose sum is σ = 23696640. Its totient is φ = 5285088.

The previous prime is 11563939. The next prime is 11563969. The reversal of 11563965 is 56936511.

11563965 is a `hidden beast` number, since 1 + 1 + 563 + 96 + 5 = 666.

It is not a de Polignac number, because 11563965 - 2⁵ = 11563933 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11563969) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 796 + ... + 4874.

It is an arithmetic number, because the mean of its divisors is an integer number (592416).

Almost surely, 2^11563965 is an apocalyptic number.

11563965 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11563965 is an abundant number, since it is smaller than the sum of its proper divisors (12132675).

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

11563965 is an equidigital number, since it uses as much as digits as its factorization.

11563965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4103 (or 4094 counting only the distinct ones).

The product of its digits is 24300, while the sum is 36.

The square root of 11563965 is about 3400.5830382451. The cubic root of 11563965 is about 226.1355922697.

The spelling of 11563965 in words is "eleven million, five hundred sixty-three thousand, nine hundred sixty-five".