679543 has 4 divisors (see below), whose sum is σ = 681928. Its totient is φ = 677160.

The previous prime is 679537. The next prime is 679561. The reversal of 679543 is 345976.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-679543 is a prime.

It is a Duffinian number.

679543 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 679499 and 679508.

It is a congruent 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 (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 696 + ... + 1357.

It is an arithmetic number, because the mean of its divisors is an integer number (170482).

2⁶⁷⁹⁵⁴³ is an apocalyptic number.

679543 is a deficient number, since it is larger than the sum of its proper divisors (2385).

679543 is a wasteful number, since it uses less digits than its factorization.

679543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2384.

The product of its digits is 22680, while the sum is 34.

The square root of 679543 is about 824.3439815999. The cubic root of 679543 is about 87.9168895073.

The spelling of 679543 in words is "six hundred seventy-nine thousand, five hundred forty-three".