689699 has 2 divisors, whose sum is σ = 689700. Its totient is φ = 689698.

The previous prime is 689693. The next prime is 689713. The reversal of 689699 is 996986.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 689699 - 2¹⁶ = 624163 is a prime.

It is not a weakly prime, because it can be changed into another prime (689693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344849 + 344850.

It is an arithmetic number, because the mean of its divisors is an integer number (344850).

2⁶⁸⁹⁶⁹⁹ is an apocalyptic number.

689699 is a deficient number, since it is larger than the sum of its proper divisors (1).

689699 is an equidigital number, since it uses as much as digits as its factorization.

689699 is an evil number, because the sum of its binary digits is even.

The product of its digits is 209952, while the sum is 47.

The square root of 689699 is about 830.4811858194. The cubic root of 689699 is about 88.3527080637.

The spelling of 689699 in words is "six hundred eighty-nine thousand, six hundred ninety-nine".