9890688839 has 2 divisors, whose sum is σ = 9890688840. Its totient is φ = 9890688838.

The previous prime is 9890688799. The next prime is 9890688869. The reversal of 9890688839 is 9388860989.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9890688839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9890688869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4945344419 + 4945344420.

It is an arithmetic number, because the mean of its divisors is an integer number (4945344420).

Almost surely, 2^9890688839 is an apocalyptic number.

9890688839 is a deficient number, since it is larger than the sum of its proper divisors (1).

9890688839 is an equidigital number, since it uses as much as digits as its factorization.

9890688839 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 53747712, while the sum is 68.

The square root of 9890688839 is about 99451.9423591113. The cubic root of 9890688839 is about 2146.5557862653. Note that the first 3 decimals are identical.

The spelling of 9890688839 in words is "nine billion, eight hundred ninety million, six hundred eighty-eight thousand, eight hundred thirty-nine".