2156679 has 16 divisors (see below), whose sum is σ = 3651840. Its totient is φ = 1232280.

The previous prime is 2156669. The next prime is 2156681. The reversal of 2156679 is 9766512.

2156679 is a `hidden beast` number, since 21 + 566 + 79 = 666.

It is not a de Polignac number, because 2156679 - 2⁵ = 2156647 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2156629) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5517 + ... + 5894.

It is an arithmetic number, because the mean of its divisors is an integer number (228240).

2^2156679 is an apocalyptic number.

2156679 is a deficient number, since it is larger than the sum of its proper divisors (1495161).

2156679 is a wasteful number, since it uses less digits than its factorization.

2156679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11427 (or 11421 counting only the distinct ones).

The product of its digits is 22680, while the sum is 36.

The square root of 2156679 is about 1468.5635839146. The cubic root of 2156679 is about 129.1997985536.

The spelling of 2156679 in words is "two million, one hundred fifty-six thousand, six hundred seventy-nine".