9990990839 has 2 divisors, whose sum is σ = 9990990840. Its totient is φ = 9990990838.

The previous prime is 9990990827. The next prime is 9990990853. The reversal of 9990990839 is 9380990999.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9990990839 - 2²⁸ = 9722555383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9990990739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4995495419 + 4995495420.

It is an arithmetic number, because the mean of its divisors is an integer number (4995495420).

Almost surely, 2^9990990839 is an apocalyptic number.

9990990839 is a deficient number, since it is larger than the sum of its proper divisors (1).

9990990839 is an equidigital number, since it uses as much as digits as its factorization.

9990990839 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12754584, while the sum is 65.

The square root of 9990990839 is about 99954.9440448045. The cubic root of 9990990839 is about 2153.7875073410.

The spelling of 9990990839 in words is "nine billion, nine hundred ninety million, nine hundred ninety thousand, eight hundred thirty-nine".