42581863 has 4 divisors (see below), whose sum is σ = 42768040. Its totient is φ = 42395688.

The previous prime is 42581779. The next prime is 42581867. The reversal of 42581863 is 36818524.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 42581863 - 2¹⁷ = 42450791 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42581867) 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, 92745 + ... + 93202.

It is an arithmetic number, because the mean of its divisors is an integer number (10692010).

Almost surely, 2^42581863 is an apocalyptic number.

42581863 is a deficient number, since it is larger than the sum of its proper divisors (186177).

42581863 is a wasteful number, since it uses less digits than its factorization.

42581863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186176.

The product of its digits is 46080, while the sum is 37.

The square root of 42581863 is about 6525.4779901552. The cubic root of 42581863 is about 349.2005235108.

The spelling of 42581863 in words is "forty-two million, five hundred eighty-one thousand, eight hundred sixty-three".