42445709 has 2 divisors, whose sum is σ = 42445710. Its totient is φ = 42445708.

The previous prime is 42445661. The next prime is 42445757. The reversal of 42445709 is 90754424.

It is a balanced prime because it is at equal distance from previous prime (42445661) and next prime (42445757).

It can be written as a sum of positive squares in only one way, i.e., 42445225 + 484 = 6515^2 + 22^2 .

It is a cyclic number.

It is not a de Polignac number, because 42445709 - 2¹² = 42441613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42445759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21222854 + 21222855.

It is an arithmetic number, because the mean of its divisors is an integer number (21222855).

Almost surely, 2^42445709 is an apocalyptic number.

It is an amenable number.

42445709 is a deficient number, since it is larger than the sum of its proper divisors (1).

42445709 is an equidigital number, since it uses as much as digits as its factorization.

42445709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40320, while the sum is 35.

The square root of 42445709 is about 6515.0371449440. The cubic root of 42445709 is about 348.8279406827.

The spelling of 42445709 in words is "forty-two million, four hundred forty-five thousand, seven hundred nine".