815238 has 32 divisors (see below), whose sum is σ = 1873920. Its totient is φ = 262440.

The previous prime is 815231. The next prime is 815251. The reversal of 815238 is 832518.

It is a happy number.

It is a super-2 number, since 2×815238² = 1329225993288, which contains 22 as substring.

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

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 815238.

It is not an unprimeable number, because it can be changed into a prime (815231) by changing a digit.

815238 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1431 + ... + 1917.

It is an arithmetic number, because the mean of its divisors is an integer number (58560).

2⁸¹⁵²³⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 815238, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (936960).

815238 is an abundant number, since it is smaller than the sum of its proper divisors (1058682).

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

815238 is a wasteful number, since it uses less digits than its factorization.

815238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 529 (or 523 counting only the distinct ones).

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

The square root of 815238 is about 902.9053106500. The cubic root of 815238 is about 93.4174779715.

Subtracting from 815238 its product of digits (1920), we obtain a palindrome (813318).

The spelling of 815238 in words is "eight hundred fifteen thousand, two hundred thirty-eight".