823431 has 16 divisors (see below), whose sum is σ = 1269504. Its totient is φ = 465024.

The previous prime is 823421. The next prime is 823447. The reversal of 823431 is 134328.

It is a happy number.

It is not a de Polignac number, because 823431 - 2⁵ = 823399 is a prime.

It is a super-2 number, since 2×823431² = 1356077223522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 823398 and 823407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (823421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2200 + ... + 2546.

It is an arithmetic number, because the mean of its divisors is an integer number (79344).

2⁸²³⁴³¹ is an apocalyptic number.

823431 is a deficient number, since it is larger than the sum of its proper divisors (446073).

823431 is a wasteful number, since it uses less digits than its factorization.

823431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 470.

The product of its digits is 576, while the sum is 21.

The square root of 823431 is about 907.4309891116. The cubic root of 823431 is about 93.7293785755.

Adding to 823431 its reverse (134328), we get a palindrome (957759).

The spelling of 823431 in words is "eight hundred twenty-three thousand, four hundred thirty-one".