8447947 has 2 divisors, whose sum is σ = 8447948. Its totient is φ = 8447946.

The previous prime is 8447939. The next prime is 8447977. The reversal of 8447947 is 7497448.

It is a happy number.

8447947 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8447947 - 2³ = 8447939 is a prime.

It is a d-powerful number, because it can be written as 8⁷ + 4⁴ + 4⁹ + 7⁴ + 9⁵ + 4⁹ + 7⁸ .

8447947 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (8447917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4223973 + 4223974.

It is an arithmetic number, because the mean of its divisors is an integer number (4223974).

Almost surely, 2^8447947 is an apocalyptic number.

8447947 is a deficient number, since it is larger than the sum of its proper divisors (1).

8447947 is an equidigital number, since it uses as much as digits as its factorization.

8447947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 225792, while the sum is 43.

The square root of 8447947 is about 2906.5352225631. The cubic root of 8447947 is about 203.6653088747.

The spelling of 8447947 in words is "eight million, four hundred forty-seven thousand, nine hundred forty-seven".