8429947 has 2 divisors, whose sum is σ = 8429948. Its totient is φ = 8429946.

The previous prime is 8429917. The next prime is 8429957. The reversal of 8429947 is 7499248.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8429947 - 2¹⁹ = 7905659 is a prime.

It is not a weakly prime, because it can be changed into another prime (8429917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4214973 + 4214974.

It is an arithmetic number, because the mean of its divisors is an integer number (4214974).

Almost surely, 2^8429947 is an apocalyptic number.

8429947 is a deficient number, since it is larger than the sum of its proper divisors (1).

8429947 is an equidigital number, since it uses as much as digits as its factorization.

8429947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 43.

The square root of 8429947 is about 2903.4371010924. The cubic root of 8429947 is about 203.5205564538.

The spelling of 8429947 in words is "eight million, four hundred twenty-nine thousand, nine hundred forty-seven".