40078181 has 12 divisors (see below), whose sum is σ = 47345760. Its totient is φ = 33630480.

The previous prime is 40078147. The next prime is 40078219. The reversal of 40078181 is 18187004.

40078181 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-40078181 is a prime.

It is a super-2 number, since 2×40078181² = 3212521184537522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40078111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8921 + ... + 12638.

It is an arithmetic number, because the mean of its divisors is an integer number (3945480).

Almost surely, 2^40078181 is an apocalyptic number.

It is an amenable number.

40078181 is a deficient number, since it is larger than the sum of its proper divisors (7267579).

40078181 is a wasteful number, since it uses less digits than its factorization.

40078181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21596 (or 21583 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 29.

The square root of 40078181 is about 6330.7330539204. The cubic root of 40078181 is about 342.2178570442.

The spelling of 40078181 in words is "forty million, seventy-eight thousand, one hundred eighty-one".