689969 has 6 divisors (see below), whose sum is σ = 802674. Its totient is φ = 591360.

The previous prime is 689963. The next prime is 689981. The reversal of 689969 is 969986.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 659344 + 30625 = 812^2 + 175^2 .

It is not a de Polignac number, because 689969 - 2⁸ = 689713 is a prime.

It is a super-2 number, since 2×689969² = 952114441922, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 689969.

It is not an unprimeable number, because it can be changed into a prime (689963) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6992 + ... + 7089.

It is an arithmetic number, because the mean of its divisors is an integer number (133779).

2⁶⁸⁹⁹⁶⁹ is an apocalyptic number.

It is an amenable number.

689969 is a deficient number, since it is larger than the sum of its proper divisors (112705).

689969 is a wasteful number, since it uses less digits than its factorization.

689969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14095 (or 14088 counting only the distinct ones).

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

The square root of 689969 is about 830.6437262750. The cubic root of 689969 is about 88.3642358553.

The spelling of 689969 in words is "six hundred eighty-nine thousand, nine hundred sixty-nine".