9985879 has 2 divisors, whose sum is σ = 9985880. Its totient is φ = 9985878.

The previous prime is 9985867. The next prime is 9985891. The reversal of 9985879 is 9785899.

It is a balanced prime because it is at equal distance from previous prime (9985867) and next prime (9985891).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9985879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9982879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4992939 + 4992940.

It is an arithmetic number, because the mean of its divisors is an integer number (4992940).

Almost surely, 2^9985879 is an apocalyptic number.

9985879 is a deficient number, since it is larger than the sum of its proper divisors (1).

9985879 is an equidigital number, since it uses as much as digits as its factorization.

9985879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1632960, while the sum is 55.

The square root of 9985879 is about 3160.0441452613. The cubic root of 9985879 is about 215.3420119915.

The spelling of 9985879 in words is "nine million, nine hundred eighty-five thousand, eight hundred seventy-nine".