8420086639 has 2 divisors, whose sum is σ = 8420086640. Its totient is φ = 8420086638.

The previous prime is 8420086637. The next prime is 8420086643. The reversal of 8420086639 is 9366800248.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8420086639 - 2¹ = 8420086637 is a prime.

Together with 8420086637, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8420086637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4210043319 + 4210043320.

It is an arithmetic number, because the mean of its divisors is an integer number (4210043320).

Almost surely, 2^8420086639 is an apocalyptic number.

8420086639 is a deficient number, since it is larger than the sum of its proper divisors (1).

8420086639 is an equidigital number, since it uses as much as digits as its factorization.

8420086639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 497664, while the sum is 46.

The square root of 8420086639 is about 91761.0300672350. The cubic root of 8420086639 is about 2034.4117402114.

The spelling of 8420086639 in words is "eight billion, four hundred twenty million, eighty-six thousand, six hundred thirty-nine".