8440220447 has 2 divisors, whose sum is σ = 8440220448. Its totient is φ = 8440220446.

The previous prime is 8440220431. The next prime is 8440220491. The reversal of 8440220447 is 7440220448.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8440220447 - 2⁴ = 8440220431 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8440220497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4220110223 + 4220110224.

It is an arithmetic number, because the mean of its divisors is an integer number (4220110224).

Almost surely, 2^8440220447 is an apocalyptic number.

8440220447 is a deficient number, since it is larger than the sum of its proper divisors (1).

8440220447 is an equidigital number, since it uses as much as digits as its factorization.

8440220447 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 57344, while the sum is 35.

The square root of 8440220447 is about 91870.6723987585. The cubic root of 8440220447 is about 2036.0319868393.

Subtracting from 8440220447 its reverse (7440220448), we obtain a palindrome (999999999).

The spelling of 8440220447 in words is "eight billion, four hundred forty million, two hundred twenty thousand, four hundred forty-seven".