42647947 has 2 divisors, whose sum is σ = 42647948. Its totient is φ = 42647946.

The previous prime is 42647933. The next prime is 42647977. The reversal of 42647947 is 74974624.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42647947 - 2¹⁵ = 42615179 is a prime.

It is not a weakly prime, because it can be changed into another prime (42647977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21323973 + 21323974.

It is an arithmetic number, because the mean of its divisors is an integer number (21323974).

Almost surely, 2^42647947 is an apocalyptic number.

42647947 is a deficient number, since it is larger than the sum of its proper divisors (1).

42647947 is an equidigital number, since it uses as much as digits as its factorization.

42647947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 338688, while the sum is 43.

The square root of 42647947 is about 6530.5395642320. The cubic root of 42647947 is about 349.3810748717.

The spelling of 42647947 in words is "forty-two million, six hundred forty-seven thousand, nine hundred forty-seven".