42509172 has 24 divisors (see below), whose sum is σ = 99449056. Its totient is φ = 14132448.

The previous prime is 42509171. The next prime is 42509177. The reversal of 42509172 is 27190524.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42509171) 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 7 ways as a sum of consecutive naturals, for example, 303 + ... + 9225.

Almost surely, 2^42509172 is an apocalyptic number.

It is an amenable number.

42509172 is an abundant number, since it is smaller than the sum of its proper divisors (56939884).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42509172 is a wasteful number, since it uses less digits than its factorization.

42509172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9327 (or 9325 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 42509172 is about 6519.9058275408. The cubic root of 42509172 is about 349.0017049585.

Adding to 42509172 its reverse (27190524), we get a palindrome (69699696).

The spelling of 42509172 in words is "forty-two million, five hundred nine thousand, one hundred seventy-two".