2156823 has 12 divisors (see below), whose sum is σ = 3279640. Its totient is φ = 1362096.

The previous prime is 2156813. The next prime is 2156839. The reversal of 2156823 is 3286512.

It is not a de Polignac number, because 2156823 - 2⁹ = 2156311 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2156813) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6136 + ... + 6477.

2^2156823 is an apocalyptic number.

2156823 is a deficient number, since it is larger than the sum of its proper divisors (1122817).

2156823 is a wasteful number, since it uses less digits than its factorization.

2156823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12638 (or 12635 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 2156823 is about 1468.6126105955. The cubic root of 2156823 is about 129.2026740174.

The spelling of 2156823 in words is "two million, one hundred fifty-six thousand, eight hundred twenty-three".