823420 has 24 divisors (see below), whose sum is σ = 1862784. Its totient is φ = 303936.

The previous prime is 823399. The next prime is 823421. The reversal of 823420 is 24328.

It is a happy number.

It is a nialpdrome in base 7.

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 7 ways as a sum of consecutive naturals, for example, 1324 + ... + 1843.

It is an arithmetic number, because the mean of its divisors is an integer number (77616).

2⁸²³⁴²⁰ is an apocalyptic number.

It is an amenable number.

823420 is an abundant number, since it is smaller than the sum of its proper divisors (1039364).

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

823420 is a wasteful number, since it uses less digits than its factorization.

823420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3189 (or 3187 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 823420 is about 907.4249280244. The cubic root of 823420 is about 93.7289612049.

Adding to 823420 its reverse (24328), we get a palindrome (847748).

The spelling of 823420 in words is "eight hundred twenty-three thousand, four hundred twenty".