42739217 has 2 divisors, whose sum is σ = 42739218. Its totient is φ = 42739216.

The previous prime is 42739163. The next prime is 42739247. The reversal of 42739217 is 71293724.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25441936 + 17297281 = 5044^2 + 4159^2 .

It is a cyclic number.

It is not a de Polignac number, because 42739217 - 2⁶ = 42739153 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42739247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21369608 + 21369609.

It is an arithmetic number, because the mean of its divisors is an integer number (21369609).

Almost surely, 2^42739217 is an apocalyptic number.

It is an amenable number.

42739217 is a deficient number, since it is larger than the sum of its proper divisors (1).

42739217 is an equidigital number, since it uses as much as digits as its factorization.

42739217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21168, while the sum is 35.

The square root of 42739217 is about 6537.5237666872. The cubic root of 42739217 is about 349.6301317223.

The spelling of 42739217 in words is "forty-two million, seven hundred thirty-nine thousand, two hundred seventeen".