42443381 has 4 divisors (see below), whose sum is σ = 42488064. Its totient is φ = 42398700.

The previous prime is 42443377. The next prime is 42443383. The reversal of 42443381 is 18334424.

42443381 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42443381 - 2² = 42443377 is a prime.

It is a super-2 number, since 2×42443381² = 3602881181422322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42443383) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 20885 + ... + 22826.

It is an arithmetic number, because the mean of its divisors is an integer number (10622016).

Almost surely, 2^42443381 is an apocalyptic number.

It is an amenable number.

42443381 is a deficient number, since it is larger than the sum of its proper divisors (44683).

42443381 is an equidigital number, since it uses as much as digits as its factorization.

42443381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44682.

The product of its digits is 9216, while the sum is 29.

The square root of 42443381 is about 6514.8584788927. The cubic root of 42443381 is about 348.8215632317.

It can be divided in two parts, 42443 and 381, that added together give a palindrome (42824).

The spelling of 42443381 in words is "forty-two million, four hundred forty-three thousand, three hundred eighty-one".