2156715 has 24 divisors (see below), whose sum is σ = 4079088. Its totient is φ = 1045440.

The previous prime is 2156711. The next prime is 2156719. The reversal of 2156715 is 5176512.

It is an interprime number because it is at equal distance from previous prime (2156711) and next prime (2156719).

It is not a de Polignac number, because 2156715 - 2² = 2156711 is a prime.

2156715 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2156711) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1684 + ... + 2673.

It is an arithmetic number, because the mean of its divisors is an integer number (169962).

2^2156715 is an apocalyptic number.

2156715 is a deficient number, since it is larger than the sum of its proper divisors (1922373).

2156715 is a wasteful number, since it uses less digits than its factorization.

2156715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4379 (or 4376 counting only the distinct ones).

The product of its digits is 2100, while the sum is 27.

The square root of 2156715 is about 1468.5758407382. The cubic root of 2156715 is about 129.2005174316.

The spelling of 2156715 in words is "two million, one hundred fifty-six thousand, seven hundred fifteen".