9990779 has 2 divisors, whose sum is σ = 9990780. Its totient is φ = 9990778.

The previous prime is 9990769. The next prime is 9990797. The reversal of 9990779 is 9770999.

Together with next prime (9990797) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9990779 - 2¹⁶ = 9925243 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (9990769) 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 as a sum of consecutive naturals, namely, 4995389 + 4995390.

It is an arithmetic number, because the mean of its divisors is an integer number (4995390).

Almost surely, 2^9990779 is an apocalyptic number.

9990779 is a deficient number, since it is larger than the sum of its proper divisors (1).

9990779 is an equidigital number, since it uses as much as digits as its factorization.

9990779 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 321489, while the sum is 50.

The square root of 9990779 is about 3160.8193558000. The cubic root of 9990779 is about 215.3772284980.

The spelling of 9990779 in words is "nine million, nine hundred ninety thousand, seven hundred seventy-nine".