9889749427 has 2 divisors, whose sum is σ = 9889749428. Its totient is φ = 9889749426.

The previous prime is 9889749409. The next prime is 9889749433. The reversal of 9889749427 is 7249479889.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9889749427 - 2²⁷ = 9755531699 is a prime.

It is not a weakly prime, because it can be changed into another prime (9889749127) 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, 4944874713 + 4944874714.

It is an arithmetic number, because the mean of its divisors is an integer number (4944874714).

Almost surely, 2^9889749427 is an apocalyptic number.

9889749427 is a deficient number, since it is larger than the sum of its proper divisors (1).

9889749427 is an equidigital number, since it uses as much as digits as its factorization.

9889749427 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 73156608, while the sum is 67.

The square root of 9889749427 is about 99447.2193025024. The cubic root of 9889749427 is about 2146.4878245644.

The spelling of 9889749427 in words is "nine billion, eight hundred eighty-nine million, seven hundred forty-nine thousand, four hundred twenty-seven".