40209966 has 32 divisors (see below), whose sum is σ = 94060800. Its totient is φ = 12697560.

The previous prime is 40209943. The next prime is 40209989. The reversal of 40209966 is 66990204.

40209966 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (40209943) and next prime (40209989).

It is a self number, because there is not a number n which added to its sum of digits gives 40209966.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 18570 + ... + 20621.

It is an arithmetic number, because the mean of its divisors is an integer number (2939400).

Almost surely, 2^40209966 is an apocalyptic number.

40209966 is an abundant number, since it is smaller than the sum of its proper divisors (53850834).

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

40209966 is a wasteful number, since it uses less digits than its factorization.

40209966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39221 (or 39215 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 40209966 is about 6341.1328640867. The cubic root of 40209966 is about 342.5925400396.

The spelling of 40209966 in words is "forty million, two hundred nine thousand, nine hundred sixty-six".