689929 has 2 divisors, whose sum is σ = 689930. Its totient is φ = 689928.

The previous prime is 689921. The next prime is 689951. The reversal of 689929 is 929986.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 462400 + 227529 = 680^2 + 477^2 .

It is a cyclic number.

It is not a de Polignac number, because 689929 - 2³ = 689921 is a prime.

It is an Ulam number.

689929 is a lucky number.

It is a nialpdrome in base 15.

It is not a weakly prime, because it can be changed into another prime (689921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344964 + 344965.

It is an arithmetic number, because the mean of its divisors is an integer number (344965).

2⁶⁸⁹⁹²⁹ is an apocalyptic number.

It is an amenable number.

689929 is a deficient number, since it is larger than the sum of its proper divisors (1).

689929 is an equidigital number, since it uses as much as digits as its factorization.

689929 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69984, while the sum is 43.

The square root of 689929 is about 830.6196482145. The cubic root of 689929 is about 88.3625282241.

The spelling of 689929 in words is "six hundred eighty-nine thousand, nine hundred twenty-nine".