40165866 has 96 divisors (see below), whose sum is σ = 103783680. Its totient is φ = 11100672.

The previous prime is 40165861. The next prime is 40165901. The reversal of 40165866 is 66856104.

40165866 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×40165866² = 3226593583059912, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 40165866.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40165861) 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 47 ways as a sum of consecutive naturals, for example, 91275 + ... + 91713.

It is an arithmetic number, because the mean of its divisors is an integer number (1081080).

Almost surely, 2^40165866 is an apocalyptic number.

40165866 is a gapful number since it is divisible by the number (46) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 40165866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51891840).

40165866 is an abundant number, since it is smaller than the sum of its proper divisors (63617814).

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

40165866 is a wasteful number, since it uses less digits than its factorization.

40165866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500 (or 497 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 40165866 is about 6337.6546134986. The cubic root of 40165866 is about 342.4672488974.

The spelling of 40165866 in words is "forty million, one hundred sixty-five thousand, eight hundred sixty-six".