40378666 has 16 divisors (see below), whose sum is σ = 61326720. Its totient is φ = 19938240.

The previous prime is 40378661. The next prime is 40378669. The reversal of 40378666 is 66687304.

It is not an unprimeable number, because it can be changed into a prime (40378661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93471 + ... + 93901.

It is an arithmetic number, because the mean of its divisors is an integer number (3832920).

Almost surely, 2^40378666 is an apocalyptic number.

40378666 is a deficient number, since it is larger than the sum of its proper divisors (20948054).

40378666 is a wasteful number, since it uses less digits than its factorization.

40378666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 909.

The product of its (nonzero) digits is 145152, while the sum is 40.

The square root of 40378666 is about 6354.4209807031. The cubic root of 40378666 is about 343.0709846371.

The spelling of 40378666 in words is "forty million, three hundred seventy-eight thousand, six hundred sixty-six".