42945709 has 2 divisors, whose sum is σ = 42945710. Its totient is φ = 42945708.

The previous prime is 42945697. The next prime is 42945731. The reversal of 42945709 is 90754924.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35736484 + 7209225 = 5978^2 + 2685^2 .

It is a cyclic number.

It is not a de Polignac number, because 42945709 - 2⁵ = 42945677 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42945739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21472854 + 21472855.

It is an arithmetic number, because the mean of its divisors is an integer number (21472855).

Almost surely, 2^42945709 is an apocalyptic number.

It is an amenable number.

42945709 is a deficient number, since it is larger than the sum of its proper divisors (1).

42945709 is an equidigital number, since it uses as much as digits as its factorization.

42945709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 42945709 is about 6553.2975668743. The cubic root of 42945709 is about 350.1922997680.

The spelling of 42945709 in words is "forty-two million, nine hundred forty-five thousand, seven hundred nine".