42502509 has 16 divisors (see below), whose sum is σ = 71962240. Its totient is φ = 24287040.

The previous prime is 42502501. The next prime is 42502511. The reversal of 42502509 is 90520524.

It is not a de Polignac number, because 42502509 - 2³ = 42502501 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42502501) 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, 112252 + ... + 112629.

It is an arithmetic number, because the mean of its divisors is an integer number (4497640).

Almost surely, 2^42502509 is an apocalyptic number.

It is an amenable number.

42502509 is a deficient number, since it is larger than the sum of its proper divisors (29459731).

42502509 is a wasteful number, since it uses less digits than its factorization.

42502509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224897 (or 224891 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 42502509 is about 6519.3948338784. The cubic root of 42502509 is about 348.9834695224.

The spelling of 42502509 in words is "forty-two million, five hundred two thousand, five hundred nine".