1679 has 4 divisors (see below), whose sum is σ = 1776. Its totient is φ = 1584.

The previous prime is 1669. The next prime is 1693. The reversal of 1679 is 9761.

It is a happy number.

1679 is nontrivially palindromic in base 12.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9761 = 43 ⋅227.

It is a cyclic number.

It is not a de Polignac number, because 1679 - 2⁴ = 1663 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 73 = 1679 / (1 + 6 + 7 + 9).

It is a Duffinian number.

1679 is an undulating number in base 12.

It is a plaindrome in base 10 and base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14 + ... + 59.

It is an arithmetic number, because the mean of its divisors is an integer number (444).

2¹⁶⁷⁹ is an apocalyptic number.

1679 is a deficient number, since it is larger than the sum of its proper divisors (97).

1679 is an equidigital number, since it uses as much as digits as its factorization.

1679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96.

The product of its digits is 378, while the sum is 23.

The square root of 1679 is about 40.9756024971. The cubic root of 1679 is about 11.8854847382.

The spelling of 1679 in words is "one thousand, six hundred seventy-nine".