215887 has 4 divisors (see below), whose sum is σ = 246736. Its totient is φ = 185040.

The previous prime is 215863. The next prime is 215893. The reversal of 215887 is 788512.

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

It is a cyclic number.

It is not a de Polignac number, because 215887 - 2¹⁵ = 183119 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15414 + ... + 15427.

It is an arithmetic number, because the mean of its divisors is an integer number (61684).

2²¹⁵⁸⁸⁷ is an apocalyptic number.

215887 is a deficient number, since it is larger than the sum of its proper divisors (30849).

215887 is an equidigital number, since it uses as much as digits as its factorization.

215887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30848.

The product of its digits is 4480, while the sum is 31.

The square root of 215887 is about 464.6364169972. The cubic root of 215887 is about 59.9895352119.

The spelling of 215887 in words is "two hundred fifteen thousand, eight hundred eighty-seven".