831921 has 8 divisors (see below), whose sum is σ = 1135200. Its totient is φ = 541632.

The previous prime is 831917. The next prime is 831967. The reversal of 831921 is 129138.

831921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 831921 - 2² = 831917 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 831891 and 831900.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 831921.

It is not an unprimeable number, because it can be changed into a prime (831911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3096 + ... + 3353.

It is an arithmetic number, because the mean of its divisors is an integer number (141900).

2⁸³¹⁹²¹ is an apocalyptic number.

It is an amenable number.

831921 is a deficient number, since it is larger than the sum of its proper divisors (303279).

831921 is a wasteful number, since it uses less digits than its factorization.

831921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6495.

The product of its digits is 432, while the sum is 24.

The square root of 831921 is about 912.0970343116. The cubic root of 831921 is about 94.0504105646.

The spelling of 831921 in words is "eight hundred thirty-one thousand, nine hundred twenty-one".