42420017 has 2 divisors, whose sum is σ = 42420018. Its totient is φ = 42420016.

The previous prime is 42420013. The next prime is 42420031. The reversal of 42420017 is 71002424.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42393121 + 26896 = 6511^2 + 164^2 .

It is a cyclic number.

It is not a de Polignac number, because 42420017 - 2² = 42420013 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42420013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21210008 + 21210009.

It is an arithmetic number, because the mean of its divisors is an integer number (21210009).

Almost surely, 2^42420017 is an apocalyptic number.

It is an amenable number.

42420017 is a deficient number, since it is larger than the sum of its proper divisors (1).

42420017 is an equidigital number, since it uses as much as digits as its factorization.

42420017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 448, while the sum is 20.

The square root of 42420017 is about 6513.0651002427. The cubic root of 42420017 is about 348.7575456888.

The spelling of 42420017 in words is "forty-two million, four hundred twenty thousand, seventeen".