42509265 has 16 divisors (see below), whose sum is σ = 72016128. Its totient is φ = 21337856.

The previous prime is 42509261. The next prime is 42509293. The reversal of 42509265 is 56290524.

It is not a de Polignac number, because 42509265 - 2² = 42509261 is a prime.

It is a super-2 number, since 2×42509265² = 3614075221680450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (42509261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83097 + ... + 83606.

It is an arithmetic number, because the mean of its divisors is an integer number (4501008).

Almost surely, 2^42509265 is an apocalyptic number.

It is an amenable number.

42509265 is a deficient number, since it is larger than the sum of its proper divisors (29506863).

42509265 is a wasteful number, since it uses less digits than its factorization.

42509265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166728.

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 42509265 is about 6519.9129595417. The cubic root of 42509265 is about 349.0019594694.

Adding to 42509265 its reverse (56290524), we get a palindrome (98799789).

The spelling of 42509265 in words is "forty-two million, five hundred nine thousand, two hundred sixty-five".