8397947 has 2 divisors, whose sum is σ = 8397948. Its totient is φ = 8397946.

The previous prime is 8397901. The next prime is 8397959. The reversal of 8397947 is 7497938.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8397947 - 2²² = 4203643 is a prime.

It is not a weakly prime, because it can be changed into another prime (8397547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4198973 + 4198974.

It is an arithmetic number, because the mean of its divisors is an integer number (4198974).

Almost surely, 2^8397947 is an apocalyptic number.

8397947 is a deficient number, since it is larger than the sum of its proper divisors (1).

8397947 is an equidigital number, since it uses as much as digits as its factorization.

8397947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 381024, while the sum is 47.

The square root of 8397947 is about 2897.9211514463. The cubic root of 8397947 is about 203.2627092063.

Subtracting from 8397947 its reverse (7497938), we obtain a palindrome (900009).

The spelling of 8397947 in words is "eight million, three hundred ninety-seven thousand, nine hundred forty-seven".