8398421807 has 2 divisors, whose sum is σ = 8398421808. Its totient is φ = 8398421806.

The previous prime is 8398421797. The next prime is 8398421809. The reversal of 8398421807 is 7081248938.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8398421807 - 2¹⁰ = 8398420783 is a prime.

Together with 8398421809, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8398421809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4199210903 + 4199210904.

It is an arithmetic number, because the mean of its divisors is an integer number (4199210904).

Almost surely, 2^8398421807 is an apocalyptic number.

8398421807 is a deficient number, since it is larger than the sum of its proper divisors (1).

8398421807 is an equidigital number, since it uses as much as digits as its factorization.

8398421807 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 774144, while the sum is 50.

The square root of 8398421807 is about 91642.9037460075. The cubic root of 8398421807 is about 2032.6653985437.

The spelling of 8398421807 in words is "eight billion, three hundred ninety-eight million, four hundred twenty-one thousand, eight hundred seven".