40181845 has 32 divisors (see below), whose sum is σ = 54722304. Its totient is φ = 28070400.

The previous prime is 40181831. The next prime is 40181861. The reversal of 40181845 is 54818104.

It is not a de Polignac number, because 40181845 - 2⁷ = 40181717 is a prime.

It is a super-2 number, since 2×40181845² = 3229161335208050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 232179 + ... + 232351.

It is an arithmetic number, because the mean of its divisors is an integer number (1710072).

Almost surely, 2^40181845 is an apocalyptic number.

It is an amenable number.

40181845 is a deficient number, since it is larger than the sum of its proper divisors (14540459).

40181845 is a wasteful number, since it uses less digits than its factorization.

40181845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333.

The product of its (nonzero) digits is 5120, while the sum is 31.

The square root of 40181845 is about 6338.9151280010. The cubic root of 40181845 is about 342.5126569283.

Adding to 40181845 its reverse (54818104), we get a palindrome (94999949).

The spelling of 40181845 in words is "forty million, one hundred eighty-one thousand, eight hundred forty-five".