679969 has 2 divisors, whose sum is σ = 679970. Its totient is φ = 679968.

The previous prime is 679961. The next prime is 679981. The reversal of 679969 is 969976.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 672400 + 7569 = 820^2 + 87^2 .

It is a cyclic number.

It is not a de Polignac number, because 679969 - 2³ = 679961 is a prime.

It is a super-2 number, since 2×679969² = 924715681922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (679961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339984 + 339985.

It is an arithmetic number, because the mean of its divisors is an integer number (339985).

2⁶⁷⁹⁹⁶⁹ is an apocalyptic number.

It is an amenable number.

679969 is a deficient number, since it is larger than the sum of its proper divisors (1).

679969 is an equidigital number, since it uses as much as digits as its factorization.

679969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 183708, while the sum is 46.

The square root of 679969 is about 824.6023283984. The cubic root of 679969 is about 87.9352571315.

The spelling of 679969 in words is "six hundred seventy-nine thousand, nine hundred sixty-nine".