3918661 has 8 divisors (see below), whose sum is σ = 4035744. Its totient is φ = 3803280.

The previous prime is 3918641. The next prime is 3918667. The reversal of 3918661 is 1668193.

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

It is not a de Polignac number, because 3918661 - 2⁹ = 3918149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3918667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5326 + ... + 6016.

It is an arithmetic number, because the mean of its divisors is an integer number (504468).

Almost surely, 2^3918661 is an apocalyptic number.

It is an amenable number.

3918661 is a deficient number, since it is larger than the sum of its proper divisors (117083).

3918661 is a wasteful number, since it uses less digits than its factorization.

3918661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 851.

The product of its digits is 7776, while the sum is 34.

The square root of 3918661 is about 1979.5608098768. The cubic root of 3918661 is about 157.6567482901.

The spelling of 3918661 in words is "three million, nine hundred eighteen thousand, six hundred sixty-one".