40186660 has 12 divisors (see below), whose sum is σ = 84392028. Its totient is φ = 16074656.

The previous prime is 40186649. The next prime is 40186669. The reversal of 40186660 is 6668104.

It can be written as a sum of positive squares in 2 ways, for example, as 31270464 + 8916196 = 5592^2 + 2986^2 .

It is a super-2 number, since 2×40186660² = 3229935283911200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (40186669) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 1004647 + ... + 1004686.

It is an arithmetic number, because the mean of its divisors is an integer number (7032669).

Almost surely, 2^40186660 is an apocalyptic number.

It is an amenable number.

40186660 is an abundant number, since it is smaller than the sum of its proper divisors (44205368).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40186660 is a wasteful number, since it uses less digits than its factorization.

40186660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2009342 (or 2009340 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 40186660 is about 6339.2949134742. The cubic root of 40186660 is about 342.5263375061.

The spelling of 40186660 in words is "forty million, one hundred eighty-six thousand, six hundred sixty".