689693 has 2 divisors, whose sum is σ = 689694. Its totient is φ = 689692.

The previous prime is 689641. The next prime is 689699. The reversal of 689693 is 396986.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 550564 + 139129 = 742^2 + 373^2 .

It is a cyclic number.

It is not a de Polignac number, because 689693 - 2⁶ = 689629 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 689693.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (689699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344846 + 344847.

It is an arithmetic number, because the mean of its divisors is an integer number (344847).

2⁶⁸⁹⁶⁹³ is an apocalyptic number.

It is an amenable number.

689693 is a deficient number, since it is larger than the sum of its proper divisors (1).

689693 is an equidigital number, since it uses as much as digits as its factorization.

689693 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69984, while the sum is 41.

The square root of 689693 is about 830.4775734480. The cubic root of 689693 is about 88.3524518564.

The spelling of 689693 in words is "six hundred eighty-nine thousand, six hundred ninety-three".