831428 has 24 divisors (see below), whose sum is σ = 1599360. Its totient is φ = 375840.

The previous prime is 831409. The next prime is 831431. The reversal of 831428 is 824138.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a junction number, because it is equal to n+sod(n) for n = 831397 and 831406.

It is an unprimeable number.

831428 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2933 + ... + 3203.

It is an arithmetic number, because the mean of its divisors is an integer number (66640).

2⁸³¹⁴²⁸ is an apocalyptic number.

It is an amenable number.

831428 is a deficient number, since it is larger than the sum of its proper divisors (767932).

831428 is a wasteful number, since it uses less digits than its factorization.

831428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347 (or 345 counting only the distinct ones).

The product of its digits is 1536, while the sum is 26.

The square root of 831428 is about 911.8267379278. The cubic root of 831428 is about 94.0318286662.

The spelling of 831428 in words is "eight hundred thirty-one thousand, four hundred twenty-eight".