42709717 has 2 divisors, whose sum is σ = 42709718. Its totient is φ = 42709716.

The previous prime is 42709697. The next prime is 42709747. The reversal of 42709717 is 71790724.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41486481 + 1223236 = 6441^2 + 1106^2 .

It is a cyclic number.

It is not a de Polignac number, because 42709717 - 2²³ = 34321109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42709747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21354858 + 21354859.

It is an arithmetic number, because the mean of its divisors is an integer number (21354859).

Almost surely, 2^42709717 is an apocalyptic number.

It is an amenable number.

42709717 is a deficient number, since it is larger than the sum of its proper divisors (1).

42709717 is an equidigital number, since it uses as much as digits as its factorization.

42709717 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24696, while the sum is 37.

The square root of 42709717 is about 6535.2671712792. The cubic root of 42709717 is about 349.5496711713.

The spelling of 42709717 in words is "forty-two million, seven hundred nine thousand, seven hundred seventeen".