623717 has 2 divisors, whose sum is σ = 623718. Its totient is φ = 623716.

The previous prime is 623699. The next prime is 623719. The reversal of 623717 is 717326.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 474721 + 148996 = 689^2 + 386^2 .

It is a cyclic number.

It is not a de Polignac number, because 623717 - 2⁶ = 623653 is a prime.

Together with 623719, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 623717.

It is not a weakly prime, because it can be changed into another prime (623719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 311858 + 311859.

It is an arithmetic number, because the mean of its divisors is an integer number (311859).

2⁶²³⁷¹⁷ is an apocalyptic number.

It is an amenable number.

623717 is a deficient number, since it is larger than the sum of its proper divisors (1).

623717 is an equidigital number, since it uses as much as digits as its factorization.

623717 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1764, while the sum is 26.

The square root of 623717 is about 789.7575577353. The cubic root of 623717 is about 85.4402532787.

The spelling of 623717 in words is "six hundred twenty-three thousand, seven hundred seventeen".