679971 has 4 divisors (see below), whose sum is σ = 906632. Its totient is φ = 453312.

The previous prime is 679969. The next prime is 679981. The reversal of 679971 is 179976.

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

It is not a de Polignac number, because 679971 - 2¹ = 679969 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (679951) 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, 113326 + ... + 113331.

It is an arithmetic number, because the mean of its divisors is an integer number (226658).

2⁶⁷⁹⁹⁷¹ is an apocalyptic number.

679971 is a deficient number, since it is larger than the sum of its proper divisors (226661).

679971 is a wasteful number, since it uses less digits than its factorization.

679971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226660.

The product of its digits is 23814, while the sum is 39.

The square root of 679971 is about 824.6035411032. The cubic root of 679971 is about 87.9353433464.

The spelling of 679971 in words is "six hundred seventy-nine thousand, nine hundred seventy-one".