42781859 has 2 divisors, whose sum is σ = 42781860. Its totient is φ = 42781858.

The previous prime is 42781847. The next prime is 42781889. The reversal of 42781859 is 95818724.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42781859 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a zygodrome in base 3.

It is not a weakly prime, because it can be changed into another prime (42781889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21390929 + 21390930.

It is an arithmetic number, because the mean of its divisors is an integer number (21390930).

Almost surely, 2^42781859 is an apocalyptic number.

42781859 is a deficient number, since it is larger than the sum of its proper divisors (1).

42781859 is an equidigital number, since it uses as much as digits as its factorization.

42781859 is an evil number, because the sum of its binary digits is even.

The product of its digits is 161280, while the sum is 44.

The square root of 42781859 is about 6540.7842801915. The cubic root of 42781859 is about 349.7463713536.

The spelling of 42781859 in words is "forty-two million, seven hundred eighty-one thousand, eight hundred fifty-nine".