6398869 has 2 divisors, whose sum is σ = 6398870. Its totient is φ = 6398868.

The previous prime is 6398867. The next prime is 6398881. The reversal of 6398869 is 9688936.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3294225 + 3104644 = 1815^2 + 1762^2 .

It is a cyclic number.

It is not a de Polignac number, because 6398869 - 2¹ = 6398867 is a prime.

It is a super-3 number, since 3×6398869³ (a number of 21 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 6398867, 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 (6398863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3199434 + 3199435.

It is an arithmetic number, because the mean of its divisors is an integer number (3199435).

Almost surely, 2^6398869 is an apocalyptic number.

It is an amenable number.

6398869 is a deficient number, since it is larger than the sum of its proper divisors (1).

6398869 is an equidigital number, since it uses as much as digits as its factorization.

6398869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 559872, while the sum is 49.

The square root of 6398869 is about 2529.5985847561. The cubic root of 6398869 is about 185.6526159565.

The spelling of 6398869 in words is "six million, three hundred ninety-eight thousand, eight hundred sixty-nine".