42006443 has 2 divisors, whose sum is σ = 42006444. Its totient is φ = 42006442.

The previous prime is 42006421. The next prime is 42006469. The reversal of 42006443 is 34460024.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42006443 - 2⁶ = 42006379 is a prime.

It is not a weakly prime, because it can be changed into another prime (42006403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21003221 + 21003222.

It is an arithmetic number, because the mean of its divisors is an integer number (21003222).

Almost surely, 2^42006443 is an apocalyptic number.

42006443 is a deficient number, since it is larger than the sum of its proper divisors (1).

42006443 is an equidigital number, since it uses as much as digits as its factorization.

42006443 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 23.

The square root of 42006443 is about 6481.2377675873. The cubic root of 42006443 is about 347.6204382145.

Adding to 42006443 its reverse (34460024), we get a palindrome (76466467).

The spelling of 42006443 in words is "forty-two million, six thousand, four hundred forty-three".