679869 has 6 divisors (see below), whose sum is σ = 982046. Its totient is φ = 453240.

The previous prime is 679867. The next prime is 679879. The reversal of 679869 is 968976.

It can be written as a sum of positive squares in only one way, i.e., 580644 + 99225 = 762^2 + 315^2 .

It is not a de Polignac number, because 679869 - 2¹ = 679867 is a prime.

It is a super-2 number, since 2×679869² = 924443714322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (679867) 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, 37762 + ... + 37779.

2⁶⁷⁹⁸⁶⁹ is an apocalyptic number.

It is an amenable number.

679869 is a deficient number, since it is larger than the sum of its proper divisors (302177).

679869 is a wasteful number, since it uses less digits than its factorization.

679869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75547 (or 75544 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 679869 is about 824.5416908805. The cubic root of 679869 is about 87.9309461718.

The spelling of 679869 in words is "six hundred seventy-nine thousand, eight hundred sixty-nine".