2156895 has 32 divisors (see below), whose sum is σ = 4132800. Its totient is φ = 1060992.

The previous prime is 2156879. The next prime is 2156897. The reversal of 2156895 is 5986512.

It is a happy number.

2156895 is a `hidden beast` number, since 2 + 1 + 568 + 95 = 666.

It is not a de Polignac number, because 2156895 - 2⁴ = 2156879 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2156897) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1141 + ... + 2369.

It is an arithmetic number, because the mean of its divisors is an integer number (129150).

2^2156895 is an apocalyptic number.

2156895 is a deficient number, since it is larger than the sum of its proper divisors (1975905).

2156895 is a wasteful number, since it uses less digits than its factorization.

2156895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1256 (or 1250 counting only the distinct ones).

The product of its digits is 21600, while the sum is 36.

The square root of 2156895 is about 1468.6371233222. The cubic root of 2156895 is about 129.2041117013.

The spelling of 2156895 in words is "two million, one hundred fifty-six thousand, eight hundred ninety-five".