2157715 has 12 divisors (see below), whose sum is σ = 3012336. Its totient is φ = 1479408.

The previous prime is 2157709. The next prime is 2157721. The reversal of 2157715 is 5177512.

It is an interprime number because it is at equal distance from previous prime (2157709) and next prime (2157721).

It is not a de Polignac number, because 2157715 - 2⁷ = 2157587 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4159 + ... + 4648.

It is an arithmetic number, because the mean of its divisors is an integer number (251028).

2^2157715 is an apocalyptic number.

2157715 is a deficient number, since it is larger than the sum of its proper divisors (854621).

2157715 is an equidigital number, since it uses as much as digits as its factorization.

2157715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8826 (or 8819 counting only the distinct ones).

The product of its digits is 2450, while the sum is 28.

The square root of 2157715 is about 1468.9162671848. The cubic root of 2157715 is about 129.2204830666.

The spelling of 2157715 in words is "two million, one hundred fifty-seven thousand, seven hundred fifteen".