42009807 has 12 divisors (see below), whose sum is σ = 65158296. Its totient is φ = 24005520.

The previous prime is 42009797. The next prime is 42009809. The reversal of 42009807 is 70890024.

It is not a de Polignac number, because 42009807 - 2¹⁸ = 41747663 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42009809) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 142744 + ... + 143037.

It is an arithmetic number, because the mean of its divisors is an integer number (5429858).

Almost surely, 2^42009807 is an apocalyptic number.

42009807 is a deficient number, since it is larger than the sum of its proper divisors (23148489).

42009807 is a wasteful number, since it uses less digits than its factorization.

42009807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285798 (or 285791 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 42009807 is about 6481.4972807215. The cubic root of 42009807 is about 347.6297174572.

The spelling of 42009807 in words is "forty-two million, nine thousand, eight hundred seven".