8344639819 has 2 divisors, whose sum is σ = 8344639820. Its totient is φ = 8344639818.

The previous prime is 8344639817. The next prime is 8344639847. The reversal of 8344639819 is 9189364438.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8344639819 - 2¹ = 8344639817 is a prime.

It is a super-2 number, since 2×8344639819² (a number of 21 digits) contains 22 as substring.

Together with 8344639817, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 8344639819.

It is not a weakly prime, because it can be changed into another prime (8344639817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4172319909 + 4172319910.

It is an arithmetic number, because the mean of its divisors is an integer number (4172319910).

Almost surely, 2^8344639819 is an apocalyptic number.

8344639819 is a deficient number, since it is larger than the sum of its proper divisors (1).

8344639819 is an equidigital number, since it uses as much as digits as its factorization.

8344639819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4478976, while the sum is 55.

The square root of 8344639819 is about 91349.0000985232. Note that the first 4 decimals coincide. The cubic root of 8344639819 is about 2028.3171618842.

The spelling of 8344639819 in words is "eight billion, three hundred forty-four million, six hundred thirty-nine thousand, eight hundred nineteen".