679799 has 4 divisors (see below), whose sum is σ = 701760. Its totient is φ = 657840.

The previous prime is 679793. The next prime is 679807. The reversal of 679799 is 997976.

679799 = T₁₁₆ + T₁₁₇ + ... + T₁₇₇.

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-679799 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (679793) 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, 10934 + ... + 10995.

It is an arithmetic number, because the mean of its divisors is an integer number (175440).

2⁶⁷⁹⁷⁹⁹ is an apocalyptic number.

679799 is a deficient number, since it is larger than the sum of its proper divisors (21961).

679799 is a wasteful number, since it uses less digits than its factorization.

679799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21960.

The product of its digits is 214326, while the sum is 47.

The square root of 679799 is about 824.4992419645. The cubic root of 679799 is about 87.9279282485.

The spelling of 679799 in words is "six hundred seventy-nine thousand, seven hundred ninety-nine".