42478771 has 2 divisors, whose sum is σ = 42478772. Its totient is φ = 42478770.

The previous prime is 42478763. The next prime is 42478831. The reversal of 42478771 is 17787424.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42478771 - 2³ = 42478763 is a prime.

It is not a weakly prime, because it can be changed into another prime (42478571) 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, 21239385 + 21239386.

It is an arithmetic number, because the mean of its divisors is an integer number (21239386).

Almost surely, 2^42478771 is an apocalyptic number.

42478771 is a deficient number, since it is larger than the sum of its proper divisors (1).

42478771 is an equidigital number, since it uses as much as digits as its factorization.

42478771 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 87808, while the sum is 40.

The square root of 42478771 is about 6517.5740118544. The cubic root of 42478771 is about 348.9184873796.

The spelling of 42478771 in words is "forty-two million, four hundred seventy-eight thousand, seven hundred seventy-one".