679945 has 8 divisors (see below), whose sum is σ = 932544. Its totient is φ = 466224.

The previous prime is 679933. The next prime is 679951. The reversal of 679945 is 549976.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 679945 - 2⁹ = 679433 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 679898 and 679907.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9679 + ... + 9748.

It is an arithmetic number, because the mean of its divisors is an integer number (116568).

2⁶⁷⁹⁹⁴⁵ is an apocalyptic number.

It is an amenable number.

679945 is a deficient number, since it is larger than the sum of its proper divisors (252599).

679945 is a wasteful number, since it uses less digits than its factorization.

679945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19439.

The product of its digits is 68040, while the sum is 40.

The square root of 679945 is about 824.5877758007. The cubic root of 679945 is about 87.9342225397.

The spelling of 679945 in words is "six hundred seventy-nine thousand, nine hundred forty-five".