9972879 has 8 divisors (see below), whose sum is σ = 15196800. Its totient is φ = 5698776.

The previous prime is 9972811. The next prime is 9972913. The reversal of 9972879 is 9782799.

It is a happy number.

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

It is not a de Polignac number, because 9972879 - 2⁸ = 9972623 is a prime.

It is a Smith number, since the sum of its digits (51) 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 (9972379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 237429 + ... + 237470.

It is an arithmetic number, because the mean of its divisors is an integer number (1899600).

Almost surely, 2^9972879 is an apocalyptic number.

9972879 is a deficient number, since it is larger than the sum of its proper divisors (5223921).

9972879 is a wasteful number, since it uses less digits than its factorization.

9972879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474909.

The product of its digits is 571536, while the sum is 51.

The square root of 9972879 is about 3157.9865420866. The cubic root of 9972879 is about 215.2485245831.

The spelling of 9972879 in words is "nine million, nine hundred seventy-two thousand, eight hundred seventy-nine".