9899643 has 16 divisors (see below), whose sum is σ = 14706720. Its totient is φ = 5881344.

The previous prime is 9899641. The next prime is 9899651. The reversal of 9899643 is 3469989.

It is a happy number.

It is not a de Polignac number, because 9899643 - 2¹ = 9899641 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 9899592 and 9899601.

It is not an unprimeable number, because it can be changed into a prime (9899641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3246 + ... + 5507.

It is an arithmetic number, because the mean of its divisors is an integer number (919170).

Almost surely, 2^9899643 is an apocalyptic number.

9899643 is a deficient number, since it is larger than the sum of its proper divisors (4807077).

9899643 is a wasteful number, since it uses less digits than its factorization.

9899643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8798.

The product of its digits is 419904, while the sum is 48.

The square root of 9899643 is about 3146.3698129749. The cubic root of 9899643 is about 214.7203358580.

The spelling of 9899643 in words is "nine million, eight hundred ninety-nine thousand, six hundred forty-three".