40818609 has 24 divisors (see below), whose sum is σ = 63725480. Its totient is φ = 25028352.

The previous prime is 40818523. The next prime is 40818671. The reversal of 40818609 is 90681804.

It is a happy number.

40818609 is a `hidden beast` number, since 40 + 8 + 1 + 8 + 609 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1166400 + 39652209 = 1080^2 + 6297^2 .

It is not a de Polignac number, because 40818609 - 2⁹ = 40818097 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (40818409) 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, 47427 + ... + 48279.

Almost surely, 2^40818609 is an apocalyptic number.

It is an amenable number.

40818609 is a deficient number, since it is larger than the sum of its proper divisors (22906871).

40818609 is a wasteful number, since it uses less digits than its factorization.

40818609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1281 (or 1278 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 40818609 is about 6388.9442789869. The cubic root of 40818609 is about 344.3124555416.

The spelling of 40818609 in words is "forty million, eight hundred eighteen thousand, six hundred nine".