42385309 has 4 divisors (see below), whose sum is σ = 42605116. Its totient is φ = 42165504.

The previous prime is 42385307. The next prime is 42385331. The reversal of 42385309 is 90358324.

It is a happy number.

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 6744409 + 35640900 = 2597^2 + 5970^2 .

It is a cyclic number.

It is not a de Polignac number, because 42385309 - 2¹ = 42385307 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42385307) 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, 109614 + ... + 109999.

It is an arithmetic number, because the mean of its divisors is an integer number (10651279).

Almost surely, 2^42385309 is an apocalyptic number.

It is an amenable number.

42385309 is a deficient number, since it is larger than the sum of its proper divisors (219807).

42385309 is a wasteful number, since it uses less digits than its factorization.

42385309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219806.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 42385309 is about 6510.4000645122. The cubic root of 42385309 is about 348.6624020860.

The spelling of 42385309 in words is "forty-two million, three hundred eighty-five thousand, three hundred nine".