9997879 has 2 divisors, whose sum is σ = 9997880. Its totient is φ = 9997878.

The previous prime is 9997877. The next prime is 9997913. The reversal of 9997879 is 9787999.

9997879 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9997879 - 2¹ = 9997877 is a prime.

Together with 9997877, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9997873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4998939 + 4998940.

It is an arithmetic number, because the mean of its divisors is an integer number (4998940).

Almost surely, 2^9997879 is an apocalyptic number.

9997879 is a deficient number, since it is larger than the sum of its proper divisors (1).

9997879 is an equidigital number, since it uses as much as digits as its factorization.

9997879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2571912, while the sum is 58.

The square root of 9997879 is about 3161.9422828382. The cubic root of 9997879 is about 215.4282360729.

The spelling of 9997879 in words is "nine million, nine hundred ninety-seven thousand, eight hundred seventy-nine".