42781342 has 4 divisors (see below), whose sum is σ = 64172016. Its totient is φ = 21390670.

The previous prime is 42781337. The next prime is 42781391. The reversal of 42781342 is 24318724.

42781342 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 is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent 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, 10695334 + ... + 10695337.

It is an arithmetic number, because the mean of its divisors is an integer number (16043004).

Almost surely, 2^42781342 is an apocalyptic number.

42781342 is a deficient number, since it is larger than the sum of its proper divisors (21390674).

42781342 is a wasteful number, since it uses less digits than its factorization.

42781342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21390673.

The product of its digits is 10752, while the sum is 31.

The square root of 42781342 is about 6540.7447588176. The cubic root of 42781342 is about 349.7449625041.

The spelling of 42781342 in words is "forty-two million, seven hundred eighty-one thousand, three hundred forty-two".