623719 has 2 divisors, whose sum is σ = 623720. Its totient is φ = 623718.

The previous prime is 623717. The next prime is 623723. The reversal of 623719 is 917326.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 623719 - 2¹ = 623717 is a prime.

It is a super-2 number, since 2×623719² = 778050781922, which contains 22 as substring.

Together with 623717, it forms a pair of twin primes.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (623717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 311859 + 311860.

It is an arithmetic number, because the mean of its divisors is an integer number (311860).

2⁶²³⁷¹⁹ is an apocalyptic number.

623719 is a deficient number, since it is larger than the sum of its proper divisors (1).

623719 is an equidigital number, since it uses as much as digits as its factorization.

623719 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2268, while the sum is 28.

The square root of 623719 is about 789.7588239456. The cubic root of 623719 is about 85.4403446024.

The spelling of 623719 in words is "six hundred twenty-three thousand, seven hundred nineteen".