40181854 has 4 divisors (see below), whose sum is σ = 60272784. Its totient is φ = 20090926.

The previous prime is 40181831. The next prime is 40181861. The reversal of 40181854 is 45818104.

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

It is a super-2 number, since 2×40181854² = 3229162781754632, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10045462 + ... + 10045465.

It is an arithmetic number, because the mean of its divisors is an integer number (15068196).

Almost surely, 2^40181854 is an apocalyptic number.

40181854 is a deficient number, since it is larger than the sum of its proper divisors (20090930).

40181854 is a wasteful number, since it uses less digits than its factorization.

40181854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20090929.

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

The square root of 40181854 is about 6338.9158379016. The cubic root of 40181854 is about 342.5126825005.

Adding to 40181854 its reverse (45818104), we get a palindrome (85999958).

The spelling of 40181854 in words is "forty million, one hundred eighty-one thousand, eight hundred fifty-four".