42508809 has 48 divisors (see below), whose sum is σ = 74131200. Its totient is φ = 22958208.

The previous prime is 42508799. The next prime is 42508847. The reversal of 42508809 is 90880524.

It is not a de Polignac number, because 42508809 - 2⁴ = 42508793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42508859) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 96612 + ... + 97050.

It is an arithmetic number, because the mean of its divisors is an integer number (1544400).

Almost surely, 2^42508809 is an apocalyptic number.

It is an amenable number.

42508809 is a deficient number, since it is larger than the sum of its proper divisors (31622391).

42508809 is a wasteful number, since it uses less digits than its factorization.

42508809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534 (or 531 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 42508809 is about 6519.8779896559. The cubic root of 42508809 is about 349.0007115417. Note that the first 3 decimals are identical.

The spelling of 42508809 in words is "forty-two million, five hundred eight thousand, eight hundred nine".