11815920 has 60 divisors (see below), whose sum is σ = 39684216. Its totient is φ = 3150720.

The previous prime is 11815879. The next prime is 11815939. The reversal of 11815920 is 2951811.

11815920 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (60).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7486 + ... + 8925.

Almost surely, 2^11815920 is an apocalyptic number.

11815920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11815920 is an abundant number, since it is smaller than the sum of its proper divisors (27868296).

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

11815920 is a wasteful number, since it uses less digits than its factorization.

11815920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16430 (or 16421 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 27.

The square root of 11815920 is about 3437.4292719996. The cubic root of 11815920 is about 227.7661498900.

The spelling of 11815920 in words is "eleven million, eight hundred fifteen thousand, nine hundred twenty".