679918 has 4 divisors (see below), whose sum is σ = 1019880. Its totient is φ = 339958.

The previous prime is 679909. The next prime is 679919. The reversal of 679918 is 819976.

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

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (679919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 169978 + ... + 169981.

It is an arithmetic number, because the mean of its divisors is an integer number (254970).

2⁶⁷⁹⁹¹⁸ is an apocalyptic number.

679918 is a deficient number, since it is larger than the sum of its proper divisors (339962).

679918 is a wasteful number, since it uses less digits than its factorization.

679918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339961.

The product of its digits is 27216, while the sum is 40.

The square root of 679918 is about 824.5714038214. The cubic root of 679918 is about 87.9330585949.

The spelling of 679918 in words is "six hundred seventy-nine thousand, nine hundred eighteen".