9938639 has 8 divisors (see below), whose sum is σ = 10106880. Its totient is φ = 9772056.

The previous prime is 9938623. The next prime is 9938641. The reversal of 9938639 is 9368399.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9938639 - 2⁴ = 9938623 is a prime.

It is a super-3 number, since 3×9938639³ (a number of 22 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9938593 and 9938602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9938239) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17372 + ... + 17934.

It is an arithmetic number, because the mean of its divisors is an integer number (1263360).

Almost surely, 2^9938639 is an apocalyptic number.

9938639 is a deficient number, since it is larger than the sum of its proper divisors (168241).

9938639 is a wasteful number, since it uses less digits than its factorization.

9938639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 829.

The product of its digits is 314928, while the sum is 47.

The square root of 9938639 is about 3152.5607052046. The cubic root of 9938639 is about 215.0019037149.

The spelling of 9938639 in words is "nine million, nine hundred thirty-eight thousand, six hundred thirty-nine".