40540509 has 24 divisors (see below), whose sum is σ = 62441600. Its totient is φ = 25272000.

The previous prime is 40540499. The next prime is 40540517. The reversal of 40540509 is 90504504.

It is not a de Polignac number, because 40540509 - 2⁹ = 40539997 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40540519) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12009 + ... + 15009.

Almost surely, 2^40540509 is an apocalyptic number.

It is an amenable number.

40540509 is a deficient number, since it is larger than the sum of its proper divisors (21901091).

40540509 is a wasteful number, since it uses less digits than its factorization.

40540509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3105 (or 3102 counting only the distinct ones).

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

The square root of 40540509 is about 6367.1429228501. The cubic root of 40540509 is about 343.5287314754.

The spelling of 40540509 in words is "forty million, five hundred forty thousand, five hundred nine".