215992 has 48 divisors (see below), whose sum is σ = 513000. Its totient is φ = 84672.

The previous prime is 215983. The next prime is 216023. The reversal of 215992 is 299512.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 215992.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7434 + ... + 7462.

2²¹⁵⁹⁹² is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (256500).

215992 is an abundant number, since it is smaller than the sum of its proper divisors (297008).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

215992 is a wasteful number, since it uses less digits than its factorization.

215992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68 (or 57 counting only the distinct ones).

The product of its digits is 1620, while the sum is 28.

The square root of 215992 is about 464.7493948355. The cubic root of 215992 is about 59.9992592501. Note that the first 3 decimals are identical.

The spelling of 215992 in words is "two hundred fifteen thousand, nine hundred ninety-two".