40659866 has 16 divisors (see below), whose sum is σ = 65977800. Its totient is φ = 18681408.

The previous prime is 40659859. The next prime is 40659881. The reversal of 40659866 is 66895604.

It can be written as a sum of positive squares in 4 ways, for example, as 36954241 + 3705625 = 6079^2 + 1925^2 .

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2540 + ... + 9368.

Almost surely, 2^40659866 is an apocalyptic number.

40659866 is a deficient number, since it is larger than the sum of its proper divisors (25317934).

40659866 is a wasteful number, since it uses less digits than its factorization.

40659866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7073.

The product of its (nonzero) digits is 311040, while the sum is 44.

The square root of 40659866 is about 6376.5089194637. The cubic root of 40659866 is about 343.8655335728.

It can be divided in two parts, 4065 and 9866, that added together give a palindrome (13931).

The spelling of 40659866 in words is "forty million, six hundred fifty-nine thousand, eight hundred sixty-six".