42805447 has 2 divisors, whose sum is σ = 42805448. Its totient is φ = 42805446.

The previous prime is 42805409. The next prime is 42805471. The reversal of 42805447 is 74450824.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42805447 - 2⁷ = 42805319 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42805487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21402723 + 21402724.

It is an arithmetic number, because the mean of its divisors is an integer number (21402724).

Almost surely, 2^42805447 is an apocalyptic number.

42805447 is a deficient number, since it is larger than the sum of its proper divisors (1).

42805447 is an equidigital number, since it uses as much as digits as its factorization.

42805447 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 35840, while the sum is 34.

The square root of 42805447 is about 6542.5871793962. The cubic root of 42805447 is about 349.8106377029.

The spelling of 42805447 in words is "forty-two million, eight hundred five thousand, four hundred forty-seven".