42887281 has 4 divisors (see below), whose sum is σ = 43474852. Its totient is φ = 42299712.

The previous prime is 42887279. The next prime is 42887309. The reversal of 42887281 is 18278824.

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 28515600 + 14371681 = 5340^2 + 3791^2 .

It is a cyclic number.

It is not a de Polignac number, because 42887281 - 2¹ = 42887279 is a prime.

It is a super-2 number, since 2×42887281² = 3678637743145922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42837281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 293676 + ... + 293821.

It is an arithmetic number, because the mean of its divisors is an integer number (10868713).

Almost surely, 2^42887281 is an apocalyptic number.

It is an amenable number.

42887281 is a deficient number, since it is larger than the sum of its proper divisors (587571).

42887281 is an equidigital number, since it uses as much as digits as its factorization.

42887281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 587570.

The product of its digits is 57344, while the sum is 40.

The square root of 42887281 is about 6548.8381412278. The cubic root of 42887281 is about 350.0334144969.

The spelling of 42887281 in words is "forty-two million, eight hundred eighty-seven thousand, two hundred eighty-one".