40555509 has 16 divisors (see below), whose sum is σ = 56572800. Its totient is φ = 25793856.

The previous prime is 40555507. The next prime is 40555511. The reversal of 40555509 is 90555504.

It is an interprime number because it is at equal distance from previous prime (40555507) and next prime (40555511).

It is not a de Polignac number, because 40555509 - 2¹ = 40555507 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40555509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40555507) 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, 48507 + ... + 49335.

It is an arithmetic number, because the mean of its divisors is an integer number (3535800).

Almost surely, 2^40555509 is an apocalyptic number.

It is an amenable number.

40555509 is a deficient number, since it is larger than the sum of its proper divisors (16017291).

40555509 is a wasteful number, since it uses less digits than its factorization.

40555509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1564.

The product of its (nonzero) digits is 22500, while the sum is 33.

The square root of 40555509 is about 6368.3207362695. The cubic root of 40555509 is about 343.5710948276.

The spelling of 40555509 in words is "forty million, five hundred fifty-five thousand, five hundred nine".