831138 has 48 divisors (see below), whose sum is σ = 2117664. Its totient is φ = 215040.

The previous prime is 831109. The next prime is 831139.

831138 is nontrivially palindromic in base 10.

831138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (831139) by changing a digit.

831138 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, 3106 + ... + 3362.

It is an arithmetic number, because the mean of its divisors is an integer number (44118).

2⁸³¹¹³⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 831138, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1058832).

831138 is an abundant number, since it is smaller than the sum of its proper divisors (1286526).

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

831138 is a wasteful number, since it uses less digits than its factorization.

831138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287 (or 280 counting only the distinct ones).

The product of its digits is 576, while the sum is 24.

The square root of 831138 is about 911.6677026198. The cubic root of 831138 is about 94.0208947062.

It can be divided in two parts, 831 and 138, that added together give a palindrome (969).

The spelling of 831138 in words is "eight hundred thirty-one thousand, one hundred thirty-eight".