7643906839 has 2 divisors, whose sum is σ = 7643906840. Its totient is φ = 7643906838.

The previous prime is 7643906833. The next prime is 7643906863. The reversal of 7643906839 is 9386093467.

It is a weak prime.

It is an emirp because it is prime and its reverse (9386093467) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7643906839 - 2¹¹ = 7643904791 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7643906839.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7643906833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3821953419 + 3821953420.

It is an arithmetic number, because the mean of its divisors is an integer number (3821953420).

Almost surely, 2^7643906839 is an apocalyptic number.

7643906839 is a deficient number, since it is larger than the sum of its proper divisors (1).

7643906839 is an equidigital number, since it uses as much as digits as its factorization.

7643906839 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5878656, while the sum is 55.

The square root of 7643906839 is about 87429.4392009922. The cubic root of 7643906839 is about 1969.8740623109.

The spelling of 7643906839 in words is "seven billion, six hundred forty-three million, nine hundred six thousand, eight hundred thirty-nine".