9999863 has 2 divisors, whose sum is σ = 9999864.
Its totient is φ = 9999862.
The previous prime is 9999823. The next prime is 9999877. The reversal of 9999863 is 3689999.
It is a strong prime.
It is a cyclic number.
It is not a de Polignac number, because 9999863 - 220 = 8951287 is a prime.
It is a nialpdrome in base 10.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (9999823) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4999931 + 4999932.
It is an arithmetic number, because the mean of its divisors is an integer number (4999932).
Almost surely, 29999863 is an apocalyptic number.
9999863 is a deficient number, since it is larger than the sum of its proper divisors (1).
9999863 is an equidigital number, since it uses as much as digits as its factorization.
9999863 is an evil number, because the sum of its binary digits is even.
The product of its digits is 944784, while the sum is 53.
The square root of 9999863 is about 3162.2559984922.
The cubic root of 9999863 is about 215.4424851402.
The spelling of 9999863 in words is "nine million, nine hundred ninety-nine thousand, eight hundred sixty-three".