40181605 has 4 divisors (see below), whose sum is σ = 48217932. Its totient is φ = 32145280.

The previous prime is 40181597. The next prime is 40181623. The reversal of 40181605 is 50618104.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 29311396 + 10870209 = 5414^2 + 3297^2 .

It is not a de Polignac number, because 40181605 - 2³ = 40181597 is a prime.

It is a super-2 number, since 2×40181605² = 3229122760752050, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40181605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4018156 + ... + 4018165.

It is an arithmetic number, because the mean of its divisors is an integer number (12054483).

Almost surely, 2^40181605 is an apocalyptic number.

It is an amenable number.

40181605 is a deficient number, since it is larger than the sum of its proper divisors (8036327).

40181605 is an equidigital number, since it uses as much as digits as its factorization.

40181605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8036326.

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 40181605 is about 6338.8961972886. The cubic root of 40181605 is about 342.5119750018.

Adding to 40181605 its reverse (50618104), we get a palindrome (90799709).

The spelling of 40181605 in words is "forty million, one hundred eighty-one thousand, six hundred five".