623839 has 2 divisors, whose sum is σ = 623840. Its totient is φ = 623838.

The previous prime is 623803. The next prime is 623851. The reversal of 623839 is 938326.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 623839 - 2⁹ = 623327 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a d-powerful number, because it can be written as 6⁷ + 2¹⁷ + 8⁵ + 3⁷ + 3¹¹ + 9³ .

It is a plaindrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 623839.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (623869) by changing a digit.

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 as a sum of consecutive naturals, namely, 311919 + 311920.

It is an arithmetic number, because the mean of its divisors is an integer number (311920).

2⁶²³⁸³⁹ is an apocalyptic number.

623839 is a deficient number, since it is larger than the sum of its proper divisors (1).

623839 is an equidigital number, since it uses as much as digits as its factorization.

623839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 31.

The square root of 623839 is about 789.8347928523. The cubic root of 623839 is about 85.4458236637.

The spelling of 623839 in words is "six hundred twenty-three thousand, eight hundred thirty-nine".