679889 has 4 divisors (see below), whose sum is σ = 777024. Its totient is φ = 582756.

The previous prime is 679883. The next prime is 679891. The reversal of 679889 is 988976.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 679889 - 2⁸ = 679633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (679883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48557 + ... + 48570.

It is an arithmetic number, because the mean of its divisors is an integer number (194256).

2⁶⁷⁹⁸⁸⁹ is an apocalyptic number.

It is an amenable number.

679889 is a deficient number, since it is larger than the sum of its proper divisors (97135).

679889 is an equidigital number, since it uses as much as digits as its factorization.

679889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97134.

The product of its digits is 217728, while the sum is 47.

The square root of 679889 is about 824.5538187408. The cubic root of 679889 is about 87.9318083976.

The spelling of 679889 in words is "six hundred seventy-nine thousand, eight hundred eighty-nine".