215838 has 32 divisors (see below), whose sum is σ = 549120. Its totient is φ = 61560.

The previous prime is 215833. The next prime is 215843. The reversal of 215838 is 838512.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (215833) and next prime (215843).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215833) 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, 93 + ... + 663.

It is an arithmetic number, because the mean of its divisors is an integer number (17160).

2²¹⁵⁸³⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215838, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (274560).

215838 is an abundant number, since it is smaller than the sum of its proper divisors (333282).

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

215838 is a wasteful number, since it uses less digits than its factorization.

215838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 589 (or 583 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 215838 is about 464.5836846038. The cubic root of 215838 is about 59.9849962484.

The spelling of 215838 in words is "two hundred fifteen thousand, eight hundred thirty-eight".