42856777 has 2 divisors, whose sum is σ = 42856778. Its totient is φ = 42856776.

The previous prime is 42856769. The next prime is 42856819. The reversal of 42856777 is 77765824.

42856777 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39702601 + 3154176 = 6301^2 + 1776^2 .

It is a cyclic number.

It is not a de Polignac number, because 42856777 - 2³ = 42856769 is a prime.

It is not a weakly prime, because it can be changed into another prime (42856727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21428388 + 21428389.

It is an arithmetic number, because the mean of its divisors is an integer number (21428389).

Almost surely, 2^42856777 is an apocalyptic number.

It is an amenable number.

42856777 is a deficient number, since it is larger than the sum of its proper divisors (1).

42856777 is an equidigital number, since it uses as much as digits as its factorization.

42856777 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 658560, while the sum is 46.

The square root of 42856777 is about 6546.5087642193. The cubic root of 42856777 is about 349.9504065786.

The spelling of 42856777 in words is "forty-two million, eight hundred fifty-six thousand, seven hundred seventy-seven".