40178661 has 8 divisors (see below), whose sum is σ = 54124224. Its totient is φ = 26509440.

The previous prime is 40178651. The next prime is 40178669. The reversal of 40178661 is 16687104.

It is a happy number.

40178661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 40178661 - 2⁵ = 40178629 is a prime.

It is a super-2 number, since 2×40178661² = 3228649599505842, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40178669) 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 7 ways as a sum of consecutive naturals, for example, 68745 + ... + 69326.

It is an arithmetic number, because the mean of its divisors is an integer number (6765528).

Almost surely, 2^40178661 is an apocalyptic number.

It is an amenable number.

40178661 is a deficient number, since it is larger than the sum of its proper divisors (13945563).

40178661 is a wasteful number, since it uses less digits than its factorization.

40178661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138171.

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 40178661 is about 6338.6639759495. The cubic root of 40178661 is about 342.5036098151.

The spelling of 40178661 in words is "forty million, one hundred seventy-eight thousand, six hundred sixty-one".