40666978 has 16 divisors (see below), whose sum is σ = 68693760. Its totient is φ = 17888400.

The previous prime is 40666939. The next prime is 40666981. The reversal of 40666978 is 87966604.

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, 29133 + ... + 30496.

It is an arithmetic number, because the mean of its divisors is an integer number (4293360).

Almost surely, 2^40666978 is an apocalyptic number.

40666978 is a deficient number, since it is larger than the sum of its proper divisors (28026782).

40666978 is a wasteful number, since it uses less digits than its factorization.

40666978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59673.

The product of its (nonzero) digits is 435456, while the sum is 46.

The square root of 40666978 is about 6377.0665670040. The cubic root of 40666978 is about 343.8855814262.

The spelling of 40666978 in words is "forty million, six hundred sixty-six thousand, nine hundred seventy-eight".