40791866 has 4 divisors (see below), whose sum is σ = 61187802. Its totient is φ = 20395932.

The previous prime is 40791827. The next prime is 40791869. The reversal of 40791866 is 66819704.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 27867841 + 12924025 = 5279^2 + 3595^2 .

It is a zygodrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (40791869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10197965 + ... + 10197968.

Almost surely, 2^40791866 is an apocalyptic number.

40791866 is a deficient number, since it is larger than the sum of its proper divisors (20395936).

40791866 is a wasteful number, since it uses less digits than its factorization.

40791866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20395935.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 40791866 is about 6386.8510237832. The cubic root of 40791866 is about 344.2372450770.

The spelling of 40791866 in words is "forty million, seven hundred ninety-one thousand, eight hundred sixty-six".