215885 has 4 divisors (see below), whose sum is σ = 259068. Its totient is φ = 172704.

The previous prime is 215863. The next prime is 215893. The reversal of 215885 is 588512.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 104329 + 111556 = 323^2 + 334^2 .

It is a cyclic number.

It is not a de Polignac number, because 215885 - 2¹² = 211789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21584 + ... + 21593.

It is an arithmetic number, because the mean of its divisors is an integer number (64767).

2²¹⁵⁸⁸⁵ is an apocalyptic number.

It is an amenable number.

215885 is a deficient number, since it is larger than the sum of its proper divisors (43183).

215885 is an equidigital number, since it uses as much as digits as its factorization.

215885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43182.

The product of its digits is 3200, while the sum is 29.

The square root of 215885 is about 464.6342647718. The cubic root of 215885 is about 59.9893499616.

The spelling of 215885 in words is "two hundred fifteen thousand, eight hundred eighty-five".