689599 has 2 divisors, whose sum is σ = 689600. Its totient is φ = 689598.

The previous prime is 689597. The next prime is 689603. The reversal of 689599 is 995986.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 689599 - 2¹ = 689597 is a prime.

Together with 689597, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (689597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344799 + 344800.

It is an arithmetic number, because the mean of its divisors is an integer number (344800).

2⁶⁸⁹⁵⁹⁹ is an apocalyptic number.

689599 is a deficient number, since it is larger than the sum of its proper divisors (1).

689599 is an equidigital number, since it uses as much as digits as its factorization.

689599 is an evil number, because the sum of its binary digits is even.

The product of its digits is 174960, while the sum is 46.

The square root of 689599 is about 830.4209775770. The cubic root of 689599 is about 88.3484377478.

The spelling of 689599 in words is "six hundred eighty-nine thousand, five hundred ninety-nine".