9869185420 has 72 divisors (see below), whose sum is σ = 21905493120. Its totient is φ = 3731051520.

The previous prime is 9869185387. The next prime is 9869185421. The reversal of 9869185420 is 245819689.

9869185420 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (9869185421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1142076 + ... + 1150684.

It is an arithmetic number, because the mean of its divisors is an integer number (304242960).

Almost surely, 2^9869185420 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9869185420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10952746560).

9869185420 is an abundant number, since it is smaller than the sum of its proper divisors (12036307700).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9869185420 is a wasteful number, since it uses less digits than its factorization.

9869185420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8735 (or 8690 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 52.

The square root of 9869185420 is about 99343.7739367697. The cubic root of 9869185420 is about 2144.9990433287. Note that the first 3 decimals are identical.

The spelling of 9869185420 in words is "nine billion, eight hundred sixty-nine million, one hundred eighty-five thousand, four hundred twenty".