11555864 has 8 divisors (see below), whose sum is σ = 21667260. Its totient is φ = 5777928.

The previous prime is 11555783. The next prime is 11555909. The reversal of 11555864 is 46855511.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 722234 + ... + 722249.

Almost surely, 2^11555864 is an apocalyptic number.

It is an amenable number.

11555864 is a deficient number, since it is larger than the sum of its proper divisors (10111396).

11555864 is a wasteful number, since it uses less digits than its factorization.

11555864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1444489 (or 1444485 counting only the distinct ones).

The product of its digits is 24000, while the sum is 35.

The square root of 11555864 is about 3399.3917102917. The cubic root of 11555864 is about 226.0827743888.

The spelling of 11555864 in words is "eleven million, five hundred fifty-five thousand, eight hundred sixty-four".