42781594 has 4 divisors (see below), whose sum is σ = 64172394. Its totient is φ = 21390796.

The previous prime is 42781589. The next prime is 42781619. The reversal of 42781594 is 49518724.

42781594 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 25250625 + 17530969 = 5025^2 + 4187^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

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, 10695397 + ... + 10695400.

Almost surely, 2^42781594 is an apocalyptic number.

42781594 is a deficient number, since it is larger than the sum of its proper divisors (21390800).

42781594 is a wasteful number, since it uses less digits than its factorization.

42781594 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21390799.

The product of its digits is 80640, while the sum is 40.

The square root of 42781594 is about 6540.7640226506. The cubic root of 42781594 is about 349.7456492175.

The spelling of 42781594 in words is "forty-two million, seven hundred eighty-one thousand, five hundred ninety-four".