215867 has 4 divisors (see below), whose sum is σ = 217560. Its totient is φ = 214176.

The previous prime is 215863. The next prime is 215893. The reversal of 215867 is 768512.

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 215867 - 2² = 215863 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 215867.

It is not an unprimeable number, because it can be changed into a prime (215863) 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, 638 + ... + 915.

It is an arithmetic number, because the mean of its divisors is an integer number (54390).

2²¹⁵⁸⁶⁷ is an apocalyptic number.

215867 is a deficient number, since it is larger than the sum of its proper divisors (1693).

215867 is a wasteful number, since it uses less digits than its factorization.

215867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1692.

The product of its digits is 3360, while the sum is 29.

The square root of 215867 is about 464.6148942942. The cubic root of 215867 is about 59.9876826567.

The spelling of 215867 in words is "two hundred fifteen thousand, eight hundred sixty-seven".