3918641 has 2 divisors, whose sum is σ = 3918642. Its totient is φ = 3918640.

The previous prime is 3918613. The next prime is 3918667. The reversal of 3918641 is 1468193.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3254416 + 664225 = 1804^2 + 815^2 .

It is an emirp because it is prime and its reverse (1468193) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3918641 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 3918598 and 3918607.

It is not a weakly prime, because it can be changed into another prime (3978641) 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 as a sum of consecutive naturals, namely, 1959320 + 1959321.

It is an arithmetic number, because the mean of its divisors is an integer number (1959321).

Almost surely, 2^3918641 is an apocalyptic number.

It is an amenable number.

3918641 is a deficient number, since it is larger than the sum of its proper divisors (1).

3918641 is an equidigital number, since it uses as much as digits as its factorization.

3918641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 32.

The square root of 3918641 is about 1979.5557582448. Note that the first 3 decimals coincide. The cubic root of 3918641 is about 157.6564800743.

The spelling of 3918641 in words is "three million, nine hundred eighteen thousand, six hundred forty-one".