9868639 has 6 divisors (see below), whose sum is σ = 10847480. Its totient is φ = 8971380.

The previous prime is 9868597. The next prime is 9868643. The reversal of 9868639 is 9368689.

It is not a de Polignac number, because 9868639 - 2⁷ = 9868511 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9868592 and 9868601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9868699) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 40659 + ... + 40900.

Almost surely, 2^9868639 is an apocalyptic number.

9868639 is a deficient number, since it is larger than the sum of its proper divisors (978841).

9868639 is a wasteful number, since it uses less digits than its factorization.

9868639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81581 (or 81570 counting only the distinct ones).

The product of its digits is 559872, while the sum is 49.

The square root of 9868639 is about 3141.4390014769. The cubic root of 9868639 is about 214.4959455732.

The spelling of 9868639 in words is "nine million, eight hundred sixty-eight thousand, six hundred thirty-nine".