42865217 has 2 divisors, whose sum is σ = 42865218. Its totient is φ = 42865216.

The previous prime is 42865187. The next prime is 42865223. The reversal of 42865217 is 71256824.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40056241 + 2808976 = 6329^2 + 1676^2 .

It is a cyclic number.

It is not a de Polignac number, because 42865217 - 2⁶ = 42865153 is a prime.

It is not a weakly prime, because it can be changed into another prime (42865247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21432608 + 21432609.

It is an arithmetic number, because the mean of its divisors is an integer number (21432609).

Almost surely, 2^42865217 is an apocalyptic number.

It is an amenable number.

42865217 is a deficient number, since it is larger than the sum of its proper divisors (1).

42865217 is an equidigital number, since it uses as much as digits as its factorization.

42865217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26880, while the sum is 35.

The square root of 42865217 is about 6547.1533508846. The cubic root of 42865217 is about 349.9733775669.

The spelling of 42865217 in words is "forty-two million, eight hundred sixty-five thousand, two hundred seventeen".