8218447 has 2 divisors, whose sum is σ = 8218448. Its totient is φ = 8218446.

The previous prime is 8218439. The next prime is 8218451. The reversal of 8218447 is 7448128.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8218447 - 2³ = 8218439 is a prime.

8218447 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8216447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4109223 + 4109224.

It is an arithmetic number, because the mean of its divisors is an integer number (4109224).

Almost surely, 2^8218447 is an apocalyptic number.

8218447 is a deficient number, since it is larger than the sum of its proper divisors (1).

8218447 is an equidigital number, since it uses as much as digits as its factorization.

8218447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14336, while the sum is 34.

The square root of 8218447 is about 2866.7833890966. The cubic root of 8218447 is about 201.8040694042.

The spelling of 8218447 in words is "eight million, two hundred eighteen thousand, four hundred forty-seven".