40666646 has 8 divisors (see below), whose sum is σ = 61047000. Its totient is φ = 20317648.

The previous prime is 40666627. The next prime is 40666657. The reversal of 40666646 is 64666604.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

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, 4271 + ... + 9978.

It is an arithmetic number, because the mean of its divisors is an integer number (7630875).

Almost surely, 2^40666646 is an apocalyptic number.

40666646 is a deficient number, since it is larger than the sum of its proper divisors (20380354).

40666646 is a wasteful number, since it uses less digits than its factorization.

40666646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15678.

The product of its (nonzero) digits is 124416, while the sum is 38.

The square root of 40666646 is about 6377.0405361735. The cubic root of 40666646 is about 343.8846456110.

The spelling of 40666646 in words is "forty million, six hundred sixty-six thousand, six hundred forty-six".