42509203 has 4 divisors (see below), whose sum is σ = 46373688. Its totient is φ = 38644720.

The previous prime is 42509179. The next prime is 42509209. The reversal of 42509203 is 30290524.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 42509203 - 2⁵ = 42509171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42509209) 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 3 ways as a sum of consecutive naturals, for example, 1932226 + ... + 1932247.

It is an arithmetic number, because the mean of its divisors is an integer number (11593422).

Almost surely, 2^42509203 is an apocalyptic number.

42509203 is a deficient number, since it is larger than the sum of its proper divisors (3864485).

42509203 is a wasteful number, since it uses less digits than its factorization.

42509203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3864484.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 42509203 is about 6519.9082048753. The cubic root of 42509203 is about 349.0017897955.

Adding to 42509203 its reverse (30290524), we get a palindrome (72799727).

The spelling of 42509203 in words is "forty-two million, five hundred nine thousand, two hundred three".