215716 has 12 divisors (see below), whose sum is σ = 380800. Its totient is φ = 106920.

The previous prime is 215693. The next prime is 215723. The reversal of 215716 is 617512.

It is an unprimeable number.

215716 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 661 + ... + 931.

2²¹⁵⁷¹⁶ is an apocalyptic number.

It is an amenable number.

215716 is a deficient number, since it is larger than the sum of its proper divisors (165084).

215716 is a wasteful number, since it uses less digits than its factorization.

215716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474 (or 472 counting only the distinct ones).

The product of its digits is 420, while the sum is 22.

The square root of 215716 is about 464.4523656953. The cubic root of 215716 is about 59.9736921704.

Subtracting from 215716 its product of digits (420), we obtain a square (215296 = 464²).

The spelling of 215716 in words is "two hundred fifteen thousand, seven hundred sixteen".