42567709 has 4 divisors (see below), whose sum is σ = 42614460. Its totient is φ = 42520960.

The previous prime is 42567697. The next prime is 42567719. The reversal of 42567709 is 90776524.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 23251684 + 19316025 = 4822^2 + 4395^2 .

It is a cyclic number.

It is not a de Polignac number, because 42567709 - 2⁹ = 42567197 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42567719) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21982 + ... + 23839.

It is an arithmetic number, because the mean of its divisors is an integer number (10653615).

Almost surely, 2^42567709 is an apocalyptic number.

It is an amenable number.

42567709 is a deficient number, since it is larger than the sum of its proper divisors (46751).

42567709 is an equidigital number, since it uses as much as digits as its factorization.

42567709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46750.

The product of its (nonzero) digits is 105840, while the sum is 40.

The square root of 42567709 is about 6524.3933817635. The cubic root of 42567709 is about 349.1618283826.

The spelling of 42567709 in words is "forty-two million, five hundred sixty-seven thousand, seven hundred nine".