40891866 has 8 divisors (see below), whose sum is σ = 81783744. Its totient is φ = 13630620.

The previous prime is 40891849. The next prime is 40891867. The reversal of 40891866 is 66819804.

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

40891866 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (40891867) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3407650 + ... + 3407661.

It is an arithmetic number, because the mean of its divisors is an integer number (10222968).

Almost surely, 2^40891866 is an apocalyptic number.

40891866 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

40891866 is a wasteful number, since it uses less digits than its factorization.

40891866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6815316.

The product of its (nonzero) digits is 82944, while the sum is 42.

The square root of 40891866 is about 6394.6748158135. The cubic root of 40891866 is about 344.5183111862.

The spelling of 40891866 in words is "forty million, eight hundred ninety-one thousand, eight hundred sixty-six".