679841 has 4 divisors (see below), whose sum is σ = 681492. Its totient is φ = 678192.

The previous prime is 679837. The next prime is 679843. The reversal of 679841 is 148976.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 160000 + 519841 = 400^2 + 721^2 .

It is a cyclic number.

It is not a de Polignac number, because 679841 - 2² = 679837 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (679843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 371 + ... + 1223.

It is an arithmetic number, because the mean of its divisors is an integer number (170373).

2⁶⁷⁹⁸⁴¹ is an apocalyptic number.

It is an amenable number.

679841 is a deficient number, since it is larger than the sum of its proper divisors (1651).

679841 is an equidigital number, since it uses as much as digits as its factorization.

679841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1650.

The product of its digits is 12096, while the sum is 35.

The square root of 679841 is about 824.5247115763. The cubic root of 679841 is about 87.9297390273.

The spelling of 679841 in words is "six hundred seventy-nine thousand, eight hundred forty-one".