42718243 has 2 divisors, whose sum is σ = 42718244. Its totient is φ = 42718242.

The previous prime is 42718237. The next prime is 42718259. The reversal of 42718243 is 34281724.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42718243 is a prime.

It is not a weakly prime, because it can be changed into another prime (42718343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21359121 + 21359122.

It is an arithmetic number, because the mean of its divisors is an integer number (21359122).

Almost surely, 2^42718243 is an apocalyptic number.

42718243 is a deficient number, since it is larger than the sum of its proper divisors (1).

42718243 is an equidigital number, since it uses as much as digits as its factorization.

42718243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10752, while the sum is 31.

The square root of 42718243 is about 6535.9194456480. The cubic root of 42718243 is about 349.5729294399.

Adding to 42718243 its reverse (34281724), we get a palindrome (76999967).

The spelling of 42718243 in words is "forty-two million, seven hundred eighteen thousand, two hundred forty-three".