42040509 has 16 divisors (see below), whose sum is σ = 65149440. Its totient is φ = 23615280.

The previous prime is 42040469. The next prime is 42040601. The reversal of 42040509 is 90504024.

It is not a de Polignac number, because 42040509 - 2⁸ = 42040253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42040109) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15727 + ... + 18204.

It is an arithmetic number, because the mean of its divisors is an integer number (4071840).

Almost surely, 2^42040509 is an apocalyptic number.

It is an amenable number.

42040509 is a deficient number, since it is larger than the sum of its proper divisors (23108931).

42040509 is a wasteful number, since it uses less digits than its factorization.

42040509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34000.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 42040509 is about 6483.8652823759. The cubic root of 42040509 is about 347.7143828355.

The spelling of 42040509 in words is "forty-two million, forty thousand, five hundred nine".