831420 has 72 divisors (see below), whose sum is σ = 2620800. Its totient is φ = 213120.

The previous prime is 831409. The next prime is 831431. The reversal of 831420 is 24138.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (831409) and next prime (831431).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 831393 and 831402.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5506 + ... + 5654.

It is an arithmetic number, because the mean of its divisors is an integer number (36400).

2⁸³¹⁴²⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 831420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1310400).

831420 is an abundant number, since it is smaller than the sum of its proper divisors (1789380).

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

831420 is a wasteful number, since it uses less digits than its factorization.

831420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195 (or 190 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 831420 is about 911.8223511189. The cubic root of 831420 is about 94.0315270738.

Adding to 831420 its reverse (24138), we get a palindrome (855558).

The spelling of 831420 in words is "eight hundred thirty-one thousand, four hundred twenty".