3918665 has 4 divisors (see below), whose sum is σ = 4702404. Its totient is φ = 3134928.

The previous prime is 3918641. The next prime is 3918667. The reversal of 3918665 is 5668193.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2226064 + 1692601 = 1492^2 + 1301^2 .

It is a cyclic number.

It is not a de Polignac number, because 3918665 - 2¹² = 3914569 is a prime.

It is a Duffinian number.

It is a Curzon 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 3 ways as a sum of consecutive naturals, for example, 391862 + ... + 391871.

It is an arithmetic number, because the mean of its divisors is an integer number (1175601).

Almost surely, 2^3918665 is an apocalyptic number.

It is an amenable number.

3918665 is a deficient number, since it is larger than the sum of its proper divisors (783739).

3918665 is an equidigital number, since it uses as much as digits as its factorization.

3918665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 783738.

The product of its digits is 38880, while the sum is 38.

The square root of 3918665 is about 1979.5618202016. The cubic root of 3918665 is about 157.6568019331.

The spelling of 3918665 in words is "three million, nine hundred eighteen thousand, six hundred sixty-five".