43491866 has 8 divisors (see below), whose sum is σ = 71168544. Its totient is φ = 19769020.

The previous prime is 43491863. The next prime is 43491871. The reversal of 43491866 is 66819434.

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

It is not an unprimeable number, because it can be changed into a prime (43491863) 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, 988430 + ... + 988473.

It is an arithmetic number, because the mean of its divisors is an integer number (8896068).

Almost surely, 2^43491866 is an apocalyptic number.

43491866 is a deficient number, since it is larger than the sum of its proper divisors (27676678).

43491866 is a wasteful number, since it uses less digits than its factorization.

43491866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1976916.

The product of its digits is 124416, while the sum is 41.

The square root of 43491866 is about 6594.8363133591. The cubic root of 43491866 is about 351.6705606161.

The spelling of 43491866 in words is "forty-three million, four hundred ninety-one thousand, eight hundred sixty-six".