215897 has 8 divisors (see below), whose sum is σ = 248160. Its totient is φ = 185760.

The previous prime is 215893. The next prime is 215899. The reversal of 215897 is 798512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 215897 - 2² = 215893 is a prime.

It is a super-2 number, since 2×215897² = 93223029218, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (215893) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 308 + ... + 725.

It is an arithmetic number, because the mean of its divisors is an integer number (31020).

2²¹⁵⁸⁹⁷ is an apocalyptic number.

It is an amenable number.

215897 is a deficient number, since it is larger than the sum of its proper divisors (32263).

215897 is a wasteful number, since it uses less digits than its factorization.

215897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1063.

The product of its digits is 5040, while the sum is 32.

The square root of 215897 is about 464.6471779749. The cubic root of 215897 is about 59.9904614466.

The spelling of 215897 in words is "two hundred fifteen thousand, eight hundred ninety-seven".