215812 has 12 divisors (see below), whose sum is σ = 381136. Its totient is φ = 106920.

The previous prime is 215801. The next prime is 215827. The reversal of 215812 is 218512.

It is a hoax number, since the sum of its digits (19) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 215812.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 487 + ... + 817.

2²¹⁵⁸¹² is an apocalyptic number.

It is an amenable number.

215812 is a deficient number, since it is larger than the sum of its proper divisors (165324).

215812 is a wasteful number, since it uses less digits than its factorization.

215812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 498 (or 496 counting only the distinct ones).

The product of its digits is 160, while the sum is 19.

The square root of 215812 is about 464.5557017194. Note that the first 3 decimals coincide. The cubic root of 215812 is about 59.9825875399.

The spelling of 215812 in words is "two hundred fifteen thousand, eight hundred twelve".