9968639 has 4 divisors (see below), whose sum is σ = 10290240. Its totient is φ = 9647040.

The previous prime is 9968633. The next prime is 9968641. The reversal of 9968639 is 9368699.

9968639 = 552² + 553² + ... + 582².

9968639 is digitally balanced in base 3, 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, and also an emirpimes, since its reverse is a distinct semiprime: 9368699 = 439 ⋅21341.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9968639 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 (9968633) 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, 160754 + ... + 160815.

It is an arithmetic number, because the mean of its divisors is an integer number (2572560).

Almost surely, 2^9968639 is an apocalyptic number.

9968639 is a deficient number, since it is larger than the sum of its proper divisors (321601).

9968639 is a wasteful number, since it uses less digits than its factorization.

9968639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321600.

The product of its digits is 629856, while the sum is 50.

The square root of 9968639 is about 3157.3151569015. The cubic root of 9968639 is about 215.2180157363.

The spelling of 9968639 in words is "nine million, nine hundred sixty-eight thousand, six hundred thirty-nine".