42697709 has 2 divisors, whose sum is σ = 42697710. Its totient is φ = 42697708.

The previous prime is 42697691. The next prime is 42697763. The reversal of 42697709 is 90779624.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40513225 + 2184484 = 6365^2 + 1478^2 .

It is a cyclic number.

It is not a de Polignac number, because 42697709 - 2¹⁶ = 42632173 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42697709.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42697789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21348854 + 21348855.

It is an arithmetic number, because the mean of its divisors is an integer number (21348855).

Almost surely, 2^42697709 is an apocalyptic number.

It is an amenable number.

42697709 is a deficient number, since it is larger than the sum of its proper divisors (1).

42697709 is an equidigital number, since it uses as much as digits as its factorization.

42697709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 190512, while the sum is 44.

The square root of 42697709 is about 6534.3483990372. The cubic root of 42697709 is about 349.5169090259.

The spelling of 42697709 in words is "forty-two million, six hundred ninety-seven thousand, seven hundred nine".