40006660 has 48 divisors (see below), whose sum is σ = 90720000. Its totient is φ = 14774144.

The previous prime is 40006621. The next prime is 40006663. The reversal of 40006660 is 6660004.

40006660 is a modest number, since divided by 6660 gives 40 as remainder.

It is not an unprimeable number, because it can be changed into a prime (40006663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11841 + ... + 14839.

It is an arithmetic number, because the mean of its divisors is an integer number (1890000).

Almost surely, 2^40006660 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40006660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45360000).

40006660 is an abundant number, since it is smaller than the sum of its proper divisors (50713340).

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

40006660 is a wasteful number, since it uses less digits than its factorization.

40006660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3060 (or 3058 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 40006660 is about 6325.0818176526. The cubic root of 40006660 is about 342.0141690150.

Adding to 40006660 its reverse (6660004), we get a palindrome (46666664).

The spelling of 40006660 in words is "forty million, six thousand, six hundred sixty".