7938641 has 2 divisors, whose sum is σ = 7938642. Its totient is φ = 7938640.

The previous prime is 7938607. The next prime is 7938649. The reversal of 7938641 is 1468397.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7075600 + 863041 = 2660^2 + 929^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7938641 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 7938595 and 7938604.

It is not a weakly prime, because it can be changed into another prime (7938649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3969320 + 3969321.

It is an arithmetic number, because the mean of its divisors is an integer number (3969321).

Almost surely, 2^7938641 is an apocalyptic number.

It is an amenable number.

7938641 is a deficient number, since it is larger than the sum of its proper divisors (1).

7938641 is an equidigital number, since it uses as much as digits as its factorization.

7938641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 38.

The square root of 7938641 is about 2817.5594048751. The cubic root of 7938641 is about 199.4873621348.

The spelling of 7938641 in words is "seven million, nine hundred thirty-eight thousand, six hundred forty-one".