215715 has 16 divisors (see below), whose sum is σ = 351648. Its totient is φ = 112896.

The previous prime is 215693. The next prime is 215723. The reversal of 215715 is 517512.

215715 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 215715 - 2⁷ = 215587 is a prime.

It is a super-2 number, since 2×215715² = 93065922450, which contains 22 as substring.

215715 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 215691 and 215700.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 997 + ... + 1193.

It is an arithmetic number, because the mean of its divisors is an integer number (21978).

2²¹⁵⁷¹⁵ is an apocalyptic number.

215715 is a deficient number, since it is larger than the sum of its proper divisors (135933).

215715 is a wasteful number, since it uses less digits than its factorization.

215715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278.

The product of its digits is 350, while the sum is 21.

The square root of 215715 is about 464.4512891574. The cubic root of 215715 is about 59.9735994964.

The spelling of 215715 in words is "two hundred fifteen thousand, seven hundred fifteen".