9906399999 has 12 divisors (see below), whose sum is σ = 14313027456. Its totient is φ = 6602520672.

The previous prime is 9906399983. The next prime is 9906400003. The reversal of 9906399999 is 9999936099.

9906399999 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9906399999 - 2⁴ = 9906399983 is a prime.

9906399999 is a modest number, since divided by 99999 gives 99063 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9906399929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 109087 + ... + 178080.

It is an arithmetic number, because the mean of its divisors is an integer number (1192752288).

Almost surely, 2^9906399999 is an apocalyptic number.

9906399999 is a deficient number, since it is larger than the sum of its proper divisors (4406627457).

9906399999 is a wasteful number, since it uses less digits than its factorization.

9906399999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291006 (or 291003 counting only the distinct ones).

The product of its (nonzero) digits is 86093442, while the sum is 72.

The square root of 9906399999 is about 99530.8997196348. The cubic root of 9906399999 is about 2147.6917718574.

The spelling of 9906399999 in words is "nine billion, nine hundred six million, three hundred ninety-nine thousand, nine hundred ninety-nine".