9855820639 has 8 divisors (see below), whose sum is σ = 11265328800. Its totient is φ = 8446695936.

The previous prime is 9855820627. The next prime is 9855820651. The reversal of 9855820639 is 9360285589.

9855820639 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (9855820627) and next prime (9855820651).

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

It is not a de Polignac number, because 9855820639 - 2⁹ = 9855820127 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 9855820639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9855820699) 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, 38494 + ... + 145579.

It is an arithmetic number, because the mean of its divisors is an integer number (1408166100).

Almost surely, 2^9855820639 is an apocalyptic number.

9855820639 is a deficient number, since it is larger than the sum of its proper divisors (1409508161).

9855820639 is a wasteful number, since it uses less digits than its factorization.

9855820639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191729.

The product of its (nonzero) digits is 4665600, while the sum is 55.

The square root of 9855820639 is about 99276.4858312380. The cubic root of 9855820639 is about 2144.0303584306.

The spelling of 9855820639 in words is "nine billion, eight hundred fifty-five million, eight hundred twenty thousand, six hundred thirty-nine".