8644397 has 2 divisors, whose sum is σ = 8644398. Its totient is φ = 8644396.

The previous prime is 8644331. The next prime is 8644439. The reversal of 8644397 is 7934468.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5885476 + 2758921 = 2426^2 + 1661^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8644397 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8644327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4322198 + 4322199.

It is an arithmetic number, because the mean of its divisors is an integer number (4322199).

Almost surely, 2^8644397 is an apocalyptic number.

It is an amenable number.

8644397 is a deficient number, since it is larger than the sum of its proper divisors (1).

8644397 is an equidigital number, since it uses as much as digits as its factorization.

8644397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 41.

The square root of 8644397 is about 2940.1355410933. The cubic root of 8644397 is about 205.2319167916.

The spelling of 8644397 in words is "eight million, six hundred forty-four thousand, three hundred ninety-seven".