831128 has 16 divisors (see below), whose sum is σ = 1626480. Its totient is φ = 397408.

The previous prime is 831109. The next prime is 831139. The reversal of 831128 is 821138.

831128 is digitally balanced in base 2, 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 (23).

It is a congruent number.

It is an unprimeable number.

831128 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 3 ways as a sum of consecutive naturals, for example, 2075 + ... + 2442.

It is an arithmetic number, because the mean of its divisors is an integer number (101655).

2⁸³¹¹²⁸ is an apocalyptic number.

It is an amenable number.

831128 is a deficient number, since it is larger than the sum of its proper divisors (795352).

831128 is a wasteful number, since it uses less digits than its factorization.

831128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4546 (or 4542 counting only the distinct ones).

The product of its digits is 384, while the sum is 23.

The square root of 831128 is about 911.6622181488. The cubic root of 831128 is about 94.0205176278.

It can be divided in two parts, 831 and 128, that added together give a palindrome (959).

The spelling of 831128 in words is "eight hundred thirty-one thousand, one hundred twenty-eight".