9990689 has 2 divisors, whose sum is σ = 9990690.
Its totient is φ = 9990688.
The previous prime is 9990683. The next prime is 9990727. The reversal of 9990689 is 9860999.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 9610000 + 380689 = 3100^2 + 617^2
It is an emirp because it is prime and its reverse (9860999) is a distict prime.
It is a cyclic number.
It is not a de Polignac number, because 9990689 - 212 = 9986593 is a prime.
It is a Chen prime.
It is a nialpdrome in base 16.
It is not a weakly prime, because it can be changed into another prime (9990683) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4995344 + 4995345.
It is an arithmetic number, because the mean of its divisors is an integer number (4995345).
Almost surely, 29990689 is an apocalyptic number.
It is an amenable number.
9990689 is a deficient number, since it is larger than the sum of its proper divisors (1).
9990689 is an equidigital number, since it uses as much as digits as its factorization.
9990689 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 314928, while the sum is 50.
The square root of 9990689 is about 3160.8051189531.
The cubic root of 9990689 is about 215.3765817680.
The spelling of 9990689 in words is "nine million, nine hundred ninety thousand, six hundred eighty-nine".