9906423999 has 4 divisors (see below), whose sum is σ = 13208565336. Its totient is φ = 6604282664.

The previous prime is 9906423959. The next prime is 9906424039. The reversal of 9906423999 is 9993246099.

9906423999 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is an interprime number because it is at equal distance from previous prime (9906423959) and next prime (9906424039).

It is a cyclic number.

It is not a de Polignac number, because 9906423999 - 2⁷ = 9906423871 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9906423949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1651070664 + ... + 1651070669.

It is an arithmetic number, because the mean of its divisors is an integer number (3302141334).

Almost surely, 2^9906423999 is an apocalyptic number.

9906423999 is a deficient number, since it is larger than the sum of its proper divisors (3302141337).

9906423999 is a wasteful number, since it uses less digits than its factorization.

9906423999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3302141336.

The product of its (nonzero) digits is 8503056, while the sum is 60.

The square root of 9906423999 is about 99531.0202851352. The cubic root of 9906423999 is about 2147.6935062433.

The spelling of 9906423999 in words is "nine billion, nine hundred six million, four hundred twenty-three thousand, nine hundred ninety-nine".