2156975 has 18 divisors (see below), whose sum is σ = 2834640. Its totient is φ = 1627920.

The previous prime is 2156939. The next prime is 2156993. The reversal of 2156975 is 5796512.

It is not a de Polignac number, because 2156975 - 2⁸ = 2156719 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 8906 + ... + 9144.

It is an arithmetic number, because the mean of its divisors is an integer number (157480).

2^2156975 is an apocalyptic number.

2156975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

2156975 is a deficient number, since it is larger than the sum of its proper divisors (677665).

2156975 is a wasteful number, since it uses less digits than its factorization.

2156975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287 (or 263 counting only the distinct ones).

The product of its digits is 18900, while the sum is 35.

The square root of 2156975 is about 1468.6643592053. The cubic root of 2156975 is about 129.2057090903.

The spelling of 2156975 in words is "two million, one hundred fifty-six thousand, nine hundred seventy-five".