623399 has 4 divisors (see below), whose sum is σ = 712464. Its totient is φ = 534336.

The previous prime is 623393. The next prime is 623401. The reversal of 623399 is 993326.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 623399 - 2⁴ = 623383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (623393) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44522 + ... + 44535.

It is an arithmetic number, because the mean of its divisors is an integer number (178116).

2⁶²³³⁹⁹ is an apocalyptic number.

623399 is a deficient number, since it is larger than the sum of its proper divisors (89065).

623399 is an equidigital number, since it uses as much as digits as its factorization.

623399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89064.

The product of its digits is 8748, while the sum is 32.

The square root of 623399 is about 789.5562044592. The cubic root of 623399 is about 85.4257303357.

The spelling of 623399 in words is "six hundred twenty-three thousand, three hundred ninety-nine".