915138 has 48 divisors (see below), whose sum is σ = 2358720. Its totient is φ = 260496.

The previous prime is 915113. The next prime is 915139. The reversal of 915138 is 831519.

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

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 915138.

It is not an unprimeable number, because it can be changed into a prime (915139) by changing a digit.

915138 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 23 ways as a sum of consecutive naturals, for example, 3268 + ... + 3536.

It is an arithmetic number, because the mean of its divisors is an integer number (49140).

2⁹¹⁵¹³⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 915138, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1179360).

915138 is an abundant number, since it is smaller than the sum of its proper divisors (1443582).

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

915138 is a wasteful number, since it uses less digits than its factorization.

915138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293 (or 281 counting only the distinct ones).

The product of its digits is 1080, while the sum is 27.

The square root of 915138 is about 956.6284545214. The cubic root of 915138 is about 97.0872492337.

The spelling of 915138 in words is "nine hundred fifteen thousand, one hundred thirty-eight".