9840785389 has 4 divisors (see below), whose sum is σ = 9845405440. Its totient is φ = 9836165340.

The previous prime is 9840785347. The next prime is 9840785413. The reversal of 9840785389 is 9835870489.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 9840785389 - 2²³ = 9832396781 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 (9840785309) 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, 2306829 + ... + 2311090.

It is an arithmetic number, because the mean of its divisors is an integer number (2461351360).

Almost surely, 2^9840785389 is an apocalyptic number.

It is an amenable number.

9840785389 is a deficient number, since it is larger than the sum of its proper divisors (4620051).

9840785389 is a wasteful number, since it uses less digits than its factorization.

9840785389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4620050.

The product of its (nonzero) digits is 17418240, while the sum is 61.

The square root of 9840785389 is about 99200.7328047530. The cubic root of 9840785389 is about 2142.9395499371.

The spelling of 9840785389 in words is "nine billion, eight hundred forty million, seven hundred eighty-five thousand, three hundred eighty-nine".