40809591 has 12 divisors (see below), whose sum is σ = 59002632. Its totient is φ = 27180816.

The previous prime is 40809581. The next prime is 40809599. The reversal of 40809591 is 19590804.

It is not a de Polignac number, because 40809591 - 2⁷ = 40809463 is a prime.

It is a super-3 number, since 3×40809591³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40809599) 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, 17125 + ... + 19361.

It is an arithmetic number, because the mean of its divisors is an integer number (4916886).

Almost surely, 2^40809591 is an apocalyptic number.

40809591 is a deficient number, since it is larger than the sum of its proper divisors (18193041).

40809591 is a wasteful number, since it uses less digits than its factorization.

40809591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4270 (or 4267 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 40809591 is about 6388.2384895995. The cubic root of 40809591 is about 344.2870975126.

The spelling of 40809591 in words is "forty million, eight hundred nine thousand, five hundred ninety-one".