2156660 has 24 divisors (see below), whose sum is σ = 4941216. Its totient is φ = 784160.

The previous prime is 2156659. The next prime is 2156669. The reversal of 2156660 is 666512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2156669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4682 + ... + 5121.

It is an arithmetic number, because the mean of its divisors is an integer number (205884).

2^2156660 is an apocalyptic number.

2156660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2156660 is an abundant number, since it is smaller than the sum of its proper divisors (2784556).

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

2156660 is a wasteful number, since it uses less digits than its factorization.

2156660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9823 (or 9821 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 2156660 is about 1468.5571149942. The cubic root of 2156660 is about 129.1994191426.

The spelling of 2156660 in words is "two million, one hundred fifty-six thousand, six hundred sixty".