689807 has 2 divisors, whose sum is σ = 689808. Its totient is φ = 689806.

The previous prime is 689803. The next prime is 689827. The reversal of 689807 is 708986.

689807 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 689807 - 2² = 689803 is a prime.

It is a Chen prime.

It is an Ulam number.

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 689807.

It is not a weakly prime, because it can be changed into another prime (689803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344903 + 344904.

It is an arithmetic number, because the mean of its divisors is an integer number (344904).

2⁶⁸⁹⁸⁰⁷ is an apocalyptic number.

689807 is a deficient number, since it is larger than the sum of its proper divisors (1).

689807 is an equidigital number, since it uses as much as digits as its factorization.

689807 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 689807 is about 830.5462058188. The cubic root of 689807 is about 88.3573195413.

The spelling of 689807 in words is "six hundred eighty-nine thousand, eight hundred seven".