7863641 has 2 divisors, whose sum is σ = 7863642. Its totient is φ = 7863640.

The previous prime is 7863637. The next prime is 7863643. The reversal of 7863641 is 1463687.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7862416 + 1225 = 2804^2 + 35^2 .

It is a cyclic number.

It is not a de Polignac number, because 7863641 - 2² = 7863637 is a prime.

Together with 7863643, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (7863643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3931820 + 3931821.

It is an arithmetic number, because the mean of its divisors is an integer number (3931821).

Almost surely, 2^7863641 is an apocalyptic number.

It is an amenable number.

7863641 is a deficient number, since it is larger than the sum of its proper divisors (1).

7863641 is an equidigital number, since it uses as much as digits as its factorization.

7863641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 35.

The square root of 7863641 is about 2804.2184294380. The cubic root of 7863641 is about 198.8571569881.

The spelling of 7863641 in words is "seven million, eight hundred sixty-three thousand, six hundred forty-one".