42297309 has 28 divisors (see below), whose sum is σ = 67167036. Its totient is φ = 26531712.

The previous prime is 42297293. The next prime is 42297313. The reversal of 42297309 is 90379224.

It can be written as a sum of positive squares in 2 ways, for example, as 36905625 + 5391684 = 6075^2 + 2322^2 .

It is not a de Polignac number, because 42297309 - 2⁴ = 42297293 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42297319) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 10687 + ... + 14099.

Almost surely, 2^42297309 is an apocalyptic number.

It is an amenable number.

42297309 is a deficient number, since it is larger than the sum of its proper divisors (24869727).

42297309 is an equidigital number, since it uses as much as digits as its factorization.

42297309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3448 (or 3433 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The square root of 42297309 is about 6503.6381356899. The cubic root of 42297309 is about 348.4209383121.

The spelling of 42297309 in words is "forty-two million, two hundred ninety-seven thousand, three hundred nine".