9999679 has 4 divisors (see below), whose sum is σ = 10022400. Its totient is φ = 9976960.

The previous prime is 9999677. The next prime is 9999713. The reversal of 9999679 is 9769999.

It is a happy number.

9999679 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9769999 = 179 ⋅54581.

It is a cyclic number.

It is not a de Polignac number, because 9999679 - 2¹ = 9999677 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 (9999677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10687 + ... + 11584.

It is an arithmetic number, because the mean of its divisors is an integer number (2505600).

Almost surely, 2^9999679 is an apocalyptic number.

9999679 is a deficient number, since it is larger than the sum of its proper divisors (22721).

9999679 is a wasteful number, since it uses less digits than its factorization.

9999679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22720.

The product of its digits is 2480058, while the sum is 58.

The square root of 9999679 is about 3162.2269052046. The cubic root of 9999679 is about 215.4411637334.

The spelling of 9999679 in words is "nine million, nine hundred ninety-nine thousand, six hundred seventy-nine".