42388217 has 2 divisors, whose sum is σ = 42388218. Its totient is φ = 42388216.

The previous prime is 42388117. The next prime is 42388223. The reversal of 42388217 is 71288324.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22505536 + 19882681 = 4744^2 + 4459^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42388217 is a prime.

It is equal to p_2569832 and since 42388217 and 2569832 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (42388237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21194108 + 21194109.

It is an arithmetic number, because the mean of its divisors is an integer number (21194109).

Almost surely, 2^42388217 is an apocalyptic number.

It is an amenable number.

42388217 is a deficient number, since it is larger than the sum of its proper divisors (1).

42388217 is an equidigital number, since it uses as much as digits as its factorization.

42388217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21504, while the sum is 35.

The square root of 42388217 is about 6510.6233956511. The cubic root of 42388217 is about 348.6703756591.

The spelling of 42388217 in words is "forty-two million, three hundred eighty-eight thousand, two hundred seventeen".