679940009 has 8 divisors (see below), whose sum is σ = 798076608. Its totient is φ = 567054000.

The previous prime is 679939991. The next prime is 679940029. The reversal of 679940009 is 900049976.

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 679940009 - 2⁸ = 679939753 is a prime.

It is not an unprimeable number, because it can be changed into a prime (679940029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1312367 + ... + 1312884.

It is an arithmetic number, because the mean of its divisors is an integer number (99759576).

Almost surely, 2^679940009 is an apocalyptic number.

It is an amenable number.

679940009 is a deficient number, since it is larger than the sum of its proper divisors (118136599).

679940009 is a wasteful number, since it uses less digits than its factorization.

679940009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2625295.

The product of its (nonzero) digits is 122472, while the sum is 44.

The square root of 679940009 is about 26075.6593205234. The cubic root of 679940009 is about 879.3400738467.

The spelling of 679940009 in words is "six hundred seventy-nine million, nine hundred forty thousand, nine".