8640039909 has 8 divisors (see below), whose sum is σ = 11534296320. Its totient is φ = 5752905056.

The previous prime is 8640039869. The next prime is 8640039911. The reversal of 8640039909 is 9099300468.

It is a happy number.

8640039909 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 8640039909 - 2⁷ = 8640039781 is a prime.

It is a super-2 number, since 2×8640039909² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8640039209) 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 7 ways as a sum of consecutive naturals, for example, 1777557 + ... + 1782410.

It is an arithmetic number, because the mean of its divisors is an integer number (1441787040).

Almost surely, 2^8640039909 is an apocalyptic number.

It is an amenable number.

8640039909 is a deficient number, since it is larger than the sum of its proper divisors (2894256411).

8640039909 is a wasteful number, since it uses less digits than its factorization.

8640039909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3560779.

The product of its (nonzero) digits is 419904, while the sum is 48.

The square root of 8640039909 is about 92951.8149849695. The cubic root of 8640039909 is about 2051.9742954252.

The spelling of 8640039909 in words is "eight billion, six hundred forty million, thirty-nine thousand, nine hundred nine".