679861 has 16 divisors (see below), whose sum is σ = 867328. Its totient is φ = 518400.

The previous prime is 679859. The next prime is 679867. The reversal of 679861 is 168976.

It is a 4-Lehmer number, since φ(679861) divides (679861-1)⁴.

It is a cyclic number.

It is not a de Polignac number, because 679861 - 2¹ = 679859 is a prime.

It is a deceptive number, since it divides R₆₇₉₈₆₀.

It is a self number, because there is not a number n which added to its sum of digits gives 679861.

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 pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2701 + ... + 2941.

It is an arithmetic number, because the mean of its divisors is an integer number (54208).

2⁶⁷⁹⁸⁶¹ is an apocalyptic number.

It is an amenable number.

679861 is a deficient number, since it is larger than the sum of its proper divisors (187467).

679861 is a wasteful number, since it uses less digits than its factorization.

679861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292.

The product of its digits is 18144, while the sum is 37.

The square root of 679861 is about 824.5368396864. The cubic root of 679861 is about 87.9306012768.

It can be divided in two parts, 6798 and 61, that added together give a cube (6859 = 19³).

The spelling of 679861 in words is "six hundred seventy-nine thousand, eight hundred sixty-one".