679929989 has 2 divisors, whose sum is σ = 679929990. Its totient is φ = 679929988.

The previous prime is 679929959. The next prime is 679930021. The reversal of 679929989 is 989929976.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 460445764 + 219484225 = 21458^2 + 14815^2 .

It is a cyclic number.

It is not a de Polignac number, because 679929989 - 2¹² = 679925893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (679929949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339964994 + 339964995.

It is an arithmetic number, because the mean of its divisors is an integer number (339964995).

Almost surely, 2^679929989 is an apocalyptic number.

It is an amenable number.

679929989 is a deficient number, since it is larger than the sum of its proper divisors (1).

679929989 is an equidigital number, since it uses as much as digits as its factorization.

679929989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 39680928, while the sum is 68.

The square root of 679929989 is about 26075.4671866105. The cubic root of 679929989 is about 879.3357543329.

The spelling of 679929989 in words is "six hundred seventy-nine million, nine hundred twenty-nine thousand, nine hundred eighty-nine".