11521864 has 8 divisors (see below), whose sum is σ = 21603510. Its totient is φ = 5760928.

The previous prime is 11521859. The next prime is 11521871. The reversal of 11521864 is 46812511.

It can be written as a sum of positive squares in only one way, i.e., 11088900 + 432964 = 3330^2 + 658^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 720109 + ... + 720124.

Almost surely, 2^11521864 is an apocalyptic number.

It is an amenable number.

11521864 is a deficient number, since it is larger than the sum of its proper divisors (10081646).

11521864 is a wasteful number, since it uses less digits than its factorization.

11521864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1440239 (or 1440235 counting only the distinct ones).

The product of its digits is 1920, while the sum is 28.

The square root of 11521864 is about 3394.3871317220. The cubic root of 11521864 is about 225.8608274631.

The spelling of 11521864 in words is "eleven million, five hundred twenty-one thousand, eight hundred sixty-four".