42040443 has 4 divisors (see below), whose sum is σ = 56053928. Its totient is φ = 28026960.

The previous prime is 42040421. The next prime is 42040447. The reversal of 42040443 is 34404024.

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

It is not a de Polignac number, because 42040443 - 2⁹ = 42039931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42040447) 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, 7006738 + ... + 7006743.

It is an arithmetic number, because the mean of its divisors is an integer number (14013482).

Almost surely, 2^42040443 is an apocalyptic number.

42040443 is a deficient number, since it is larger than the sum of its proper divisors (14013485).

42040443 is a wasteful number, since it uses less digits than its factorization.

42040443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14013484.

The product of its (nonzero) digits is 1536, while the sum is 21.

The square root of 42040443 is about 6483.8601928172. The cubic root of 42040443 is about 347.7142008748.

Adding to 42040443 its reverse (34404024), we get a palindrome (76444467).

The spelling of 42040443 in words is "forty-two million, forty thousand, four hundred forty-three".