215922 has 32 divisors (see below), whose sum is σ = 508032. Its totient is φ = 59904.

The previous prime is 215921. The next prime is 215927. The reversal of 215922 is 229512.

215922 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (215921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2178 + ... + 2274.

It is an arithmetic number, because the mean of its divisors is an integer number (15876).

2²¹⁵⁹²² is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215922, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (254016).

215922 is an abundant number, since it is smaller than the sum of its proper divisors (292110).

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

215922 is a wasteful number, since it uses less digits than its factorization.

215922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162.

The product of its digits is 360, while the sum is 21.

The square root of 215922 is about 464.6740793287. The cubic root of 215922 is about 59.9927769083.

The spelling of 215922 in words is "two hundred fifteen thousand, nine hundred twenty-two".