9995999 has 4 divisors (see below), whose sum is σ = 10764936. Its totient is φ = 9227064.

The previous prime is 9995989. The next prime is 9996001.

9995999 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 9995999 - 2⁸ = 9995743 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9995989) 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 in 3 ways as a sum of consecutive naturals, for example, 384449 + ... + 384474.

It is an arithmetic number, because the mean of its divisors is an integer number (2691234).

Almost surely, 2^9995999 is an apocalyptic number.

9995999 is a deficient number, since it is larger than the sum of its proper divisors (768937).

9995999 is a wasteful number, since it uses less digits than its factorization.

9995999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 768936.

The product of its digits is 2657205, while the sum is 59.

The square root of 9995999 is about 3161.6449832326. The cubic root of 9995999 is about 215.4147321930.

The spelling of 9995999 in words is "nine million, nine hundred ninety-five thousand, nine hundred ninety-nine".