689723 has 2 divisors, whose sum is σ = 689724. Its totient is φ = 689722.

The previous prime is 689713. The next prime is 689761. The reversal of 689723 is 327986.

689723 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 689723 - 2⁸ = 689467 is a prime.

It is a Sophie Germain prime.

It is a d-powerful number, because it can be written as 6⁵ + 8 + 7⁶ + 9² + 2¹⁵ + 3¹² .

It is not a weakly prime, because it can be changed into another prime (689713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344861 + 344862.

It is an arithmetic number, because the mean of its divisors is an integer number (344862).

2⁶⁸⁹⁷²³ is an apocalyptic number.

689723 is a deficient number, since it is larger than the sum of its proper divisors (1).

689723 is an equidigital number, since it uses as much as digits as its factorization.

689723 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 35.

The square root of 689723 is about 830.4956351481. The cubic root of 689723 is about 88.3537328781.

The spelling of 689723 in words is "six hundred eighty-nine thousand, seven hundred twenty-three".