9872639 has 4 divisors (see below), whose sum is σ = 11283024. Its totient is φ = 8462256.

The previous prime is 9872623. The next prime is 9872641. The reversal of 9872639 is 9362789.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 9872639 - 2⁴ = 9872623 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9872639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9872659) 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, 705182 + ... + 705195.

It is an arithmetic number, because the mean of its divisors is an integer number (2820756).

Almost surely, 2^9872639 is an apocalyptic number.

9872639 is a deficient number, since it is larger than the sum of its proper divisors (1410385).

9872639 is a wasteful number, since it uses less digits than its factorization.

9872639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1410384.

The product of its digits is 163296, while the sum is 44.

The square root of 9872639 is about 3142.0755878877. The cubic root of 9872639 is about 214.5249218041.

The spelling of 9872639 in words is "nine million, eight hundred seventy-two thousand, six hundred thirty-nine".