9906623 has 4 divisors (see below), whose sum is σ = 9940728. Its totient is φ = 9872520.

The previous prime is 9906599. The next prime is 9906653. The reversal of 9906623 is 3266099.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3266099 = 751 ⋅4349.

It is a cyclic number.

It is not a de Polignac number, because 9906623 - 2⁸ = 9906367 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9906653) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16613 + ... + 17198.

It is an arithmetic number, because the mean of its divisors is an integer number (2485182).

Almost surely, 2^9906623 is an apocalyptic number.

9906623 is a deficient number, since it is larger than the sum of its proper divisors (34105).

9906623 is a wasteful number, since it uses less digits than its factorization.

9906623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34104.

The product of its (nonzero) digits is 17496, while the sum is 35.

The square root of 9906623 is about 3147.4788323355. The cubic root of 9906623 is about 214.7707887157.

The spelling of 9906623 in words is "nine million, nine hundred six thousand, six hundred twenty-three".