42538817 has 2 divisors, whose sum is σ = 42538818. Its totient is φ = 42538816.

The previous prime is 42538759. The next prime is 42538819. The reversal of 42538817 is 71883524.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42523441 + 15376 = 6521^2 + 124^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42538817 is a prime.

Together with 42538819, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42538819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21269408 + 21269409.

It is an arithmetic number, because the mean of its divisors is an integer number (21269409).

Almost surely, 2^42538817 is an apocalyptic number.

It is an amenable number.

42538817 is a deficient number, since it is larger than the sum of its proper divisors (1).

42538817 is an equidigital number, since it uses as much as digits as its factorization.

42538817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 53760, while the sum is 38.

The square root of 42538817 is about 6522.1788537267. The cubic root of 42538817 is about 349.0828149161.

The spelling of 42538817 in words is "forty-two million, five hundred thirty-eight thousand, eight hundred seventeen".