42398717 has 2 divisors, whose sum is σ = 42398718. Its totient is φ = 42398716.

The previous prime is 42398701. The next prime is 42398723. The reversal of 42398717 is 71789324.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32501401 + 9897316 = 5701^2 + 3146^2 .

It is a cyclic number.

It is not a de Polignac number, because 42398717 - 2⁴ = 42398701 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42398117) 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, 21199358 + 21199359.

It is an arithmetic number, because the mean of its divisors is an integer number (21199359).

Almost surely, 2^42398717 is an apocalyptic number.

It is an amenable number.

42398717 is a deficient number, since it is larger than the sum of its proper divisors (1).

42398717 is an equidigital number, since it uses as much as digits as its factorization.

42398717 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84672, while the sum is 41.

The square root of 42398717 is about 6511.4297201152. The cubic root of 42398717 is about 348.6991630356.

The spelling of 42398717 in words is "forty-two million, three hundred ninety-eight thousand, seven hundred seventeen".