9864189849 has 4 divisors (see below), whose sum is σ = 13152253136. Its totient is φ = 6576126564.

The previous prime is 9864189847. The next prime is 9864189857. The reversal of 9864189849 is 9489814689.

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 not a de Polignac number, because 9864189849 - 2¹ = 9864189847 is a prime.

It is a super-2 number, since 2×9864189849² (a number of 21 digits) contains 22 as substring.

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 9864189849.

It is not an unprimeable number, because it can be changed into a prime (9864189847) 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, 1644031639 + ... + 1644031644.

It is an arithmetic number, because the mean of its divisors is an integer number (3288063284).

Almost surely, 2^9864189849 is an apocalyptic number.

It is an amenable number.

9864189849 is a deficient number, since it is larger than the sum of its proper divisors (3288063287).

9864189849 is a wasteful number, since it uses less digits than its factorization.

9864189849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3288063286.

The product of its digits is 35831808, while the sum is 66.

The square root of 9864189849 is about 99318.6279053431. The cubic root of 9864189849 is about 2144.6370646697.

The spelling of 9864189849 in words is "nine billion, eight hundred sixty-four million, one hundred eighty-nine thousand, eight hundred forty-nine".