40816509 has 8 divisors (see below), whose sum is σ = 54707712. Its totient is φ = 27068160.

The previous prime is 40816499. The next prime is 40816561. The reversal of 40816509 is 90561804.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 40816509 - 2⁴ = 40816493 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40816509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40816309) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35044 + ... + 36189.

It is an arithmetic number, because the mean of its divisors is an integer number (6838464).

Almost surely, 2^40816509 is an apocalyptic number.

It is an amenable number.

40816509 is a deficient number, since it is larger than the sum of its proper divisors (13891203).

40816509 is a wasteful number, since it uses less digits than its factorization.

40816509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71427.

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 40816509 is about 6388.7799304719. The cubic root of 40816509 is about 344.3065508119.

The spelling of 40816509 in words is "forty million, eight hundred sixteen thousand, five hundred nine".