42420043 has 4 divisors (see below), whose sum is σ = 42816600. Its totient is φ = 42023488.

The previous prime is 42420031. The next prime is 42420067. The reversal of 42420043 is 34002424.

42420043 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.

It is a cyclic number.

It is not a de Polignac number, because 42420043 - 2¹⁷ = 42288971 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42420043.

It is not an unprimeable number, because it can be changed into a prime (42420013) 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, 198118 + ... + 198331.

It is an arithmetic number, because the mean of its divisors is an integer number (10704150).

Almost surely, 2^42420043 is an apocalyptic number.

42420043 is a deficient number, since it is larger than the sum of its proper divisors (396557).

42420043 is a wasteful number, since it uses less digits than its factorization.

42420043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396556.

The product of its (nonzero) digits is 768, while the sum is 19.

The square root of 42420043 is about 6513.0670962305. The cubic root of 42420043 is about 348.7576169420.

Adding to 42420043 its reverse (34002424), we get a palindrome (76422467).

The spelling of 42420043 in words is "forty-two million, four hundred twenty thousand, forty-three".