42401243 has 2 divisors, whose sum is σ = 42401244. Its totient is φ = 42401242.

The previous prime is 42401239. The next prime is 42401251. The reversal of 42401243 is 34210424.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42401243 - 2² = 42401239 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42401263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21200621 + 21200622.

It is an arithmetic number, because the mean of its divisors is an integer number (21200622).

Almost surely, 2^42401243 is an apocalyptic number.

42401243 is a deficient number, since it is larger than the sum of its proper divisors (1).

42401243 is an equidigital number, since it uses as much as digits as its factorization.

42401243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 42401243 is about 6511.6236838441. The cubic root of 42401243 is about 348.7060877467.

Adding to 42401243 its reverse (34210424), we get a palindrome (76611667).

The spelling of 42401243 in words is "forty-two million, four hundred one thousand, two hundred forty-three".