42740281 has 4 divisors (see below), whose sum is σ = 42817572. Its totient is φ = 42662992.

The previous prime is 42740239. The next prime is 42740297. The reversal of 42740281 is 18204724.

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

It can be written as a sum of positive squares in 2 ways, for example, as 27405225 + 15335056 = 5235^2 + 3916^2 .

It is a cyclic number.

It is not a de Polignac number, because 42740281 - 2⁷ = 42740153 is a prime.

It is a super-2 number, since 2×42740281² = 3653463239917922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42740681) 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 in 3 ways as a sum of consecutive naturals, for example, 37810 + ... + 38923.

It is an arithmetic number, because the mean of its divisors is an integer number (10704393).

Almost surely, 2^42740281 is an apocalyptic number.

It is an amenable number.

42740281 is a deficient number, since it is larger than the sum of its proper divisors (77291).

42740281 is an equidigital number, since it uses as much as digits as its factorization.

42740281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77290.

The product of its (nonzero) digits is 3584, while the sum is 28.

The square root of 42740281 is about 6537.6051425579. The cubic root of 42740281 is about 349.6330330652.

The spelling of 42740281 in words is "forty-two million, seven hundred forty thousand, two hundred eighty-one".