9939860649 has 20 divisors (see below), whose sum is σ = 14886651780. Its totient is φ = 6609517920.

The previous prime is 9939860647. The next prime is 9939860657. The reversal of 9939860649 is 9460689399.

9939860649 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 2255585049 + 7684275600 = 47493^2 + 87660^2 .

It is not a de Polignac number, because 9939860649 - 2¹ = 9939860647 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9939860647) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 126222 + ... + 189239.

It is an arithmetic number, because the mean of its divisors is an integer number (744332589).

Almost surely, 2^9939860649 is an apocalyptic number.

It is an amenable number.

9939860649 is a deficient number, since it is larger than the sum of its proper divisors (4946791131).

9939860649 is a wasteful number, since it uses less digits than its factorization.

9939860649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315862 (or 315853 counting only the distinct ones).

The product of its (nonzero) digits is 22674816, while the sum is 63.

The square root of 9939860649 is about 99698.8497877483. The cubic root of 9939860649 is about 2150.1071263730.

The spelling of 9939860649 in words is "nine billion, nine hundred thirty-nine million, eight hundred sixty thousand, six hundred forty-nine".