9999739 has 2 divisors, whose sum is σ = 9999740.
Its totient is φ = 9999738.
The previous prime is 9999713. The next prime is 9999749. The reversal of 9999739 is 9379999.
It is a strong prime.
It is an emirp because it is prime and its reverse (9379999) is a distict prime.
It is a cyclic number.
It is not a de Polignac number, because 9999739 - 219 = 9475451 is a prime.
9999739 is a lucky number.
It is a self number, because there is not a number n which added to its sum of digits gives 9999739.
It is not a weakly prime, because it can be changed into another prime (9999749) 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, 4999869 + 4999870.
It is an arithmetic number, because the mean of its divisors is an integer number (4999870).
Almost surely, 29999739 is an apocalyptic number.
9999739 is a deficient number, since it is larger than the sum of its proper divisors (1).
9999739 is an equidigital number, since it uses as much as digits as its factorization.
9999739 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 1240029, while the sum is 55.
The square root of 9999739 is about 3162.2363921756.
The cubic root of 9999739 is about 215.4415946287.
The spelling of 9999739 in words is "nine million, nine hundred ninety-nine thousand, seven hundred thirty-nine".