2156560 has 40 divisors (see below), whose sum is σ = 5731776. Its totient is φ = 739200.

The previous prime is 2156537. The next prime is 2156597. The reversal of 2156560 is 656512.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1366 + ... + 2485.

2^2156560 is an apocalyptic number.

2156560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2156560 is an abundant number, since it is smaller than the sum of its proper divisors (3575216).

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

2156560 is a wasteful number, since it uses less digits than its factorization.

2156560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3871 (or 3865 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 2156560 is about 1468.5230675750. The cubic root of 2156560 is about 129.1974222057.

The spelling of 2156560 in words is "two million, one hundred fifty-six thousand, five hundred sixty".