40181855 has 16 divisors (see below), whose sum is σ = 55478784. Its totient is φ = 27367200.

The previous prime is 40181831. The next prime is 40181861. The reversal of 40181855 is 55818104.

It is not a de Polignac number, because 40181855 - 2¹² = 40177759 is a prime.

It is a super-2 number, since 2×40181855² = 3229162942482050, 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 15 ways as a sum of consecutive naturals, for example, 1484 + ... + 9086.

It is an arithmetic number, because the mean of its divisors is an integer number (3467424).

Almost surely, 2^40181855 is an apocalyptic number.

40181855 is a deficient number, since it is larger than the sum of its proper divisors (15296929).

40181855 is a wasteful number, since it uses less digits than its factorization.

40181855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7766.

The product of its (nonzero) digits is 6400, while the sum is 32.

The square root of 40181855 is about 6338.9159167795. The cubic root of 40181855 is about 342.5126853419.

Adding to 40181855 its reverse (55818104), we get a palindrome (95999959).

The spelling of 40181855 in words is "forty million, one hundred eighty-one thousand, eight hundred fifty-five".