679805 has 8 divisors (see below), whose sum is σ = 932352. Its totient is φ = 466128.

The previous prime is 679793. The next prime is 679807. The reversal of 679805 is 508976.

679805 = 122² + 123² + ... + 156².

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 679805 - 2⁶ = 679741 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35), and also a Moran number because the ratio is a prime number: 19423 = 679805 / (6 + 7 + 9 + 8 + 0 + 5).

It is a Duffinian number.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (679807) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9677 + ... + 9746.

It is an arithmetic number, because the mean of its divisors is an integer number (116544).

2⁶⁷⁹⁸⁰⁵ is an apocalyptic number.

It is an amenable number.

679805 is a deficient number, since it is larger than the sum of its proper divisors (252547).

679805 is a wasteful number, since it uses less digits than its factorization.

679805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19435.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 679805 is about 824.5028805286. The cubic root of 679805 is about 87.9281869358.

It can be divided in two parts, 67980 and 5, that multiplied together give a triangular number (339900 = T₈₂₄).

The spelling of 679805 in words is "six hundred seventy-nine thousand, eight hundred five".