7643813 has 2 divisors, whose sum is σ = 7643814. Its totient is φ = 7643812.

The previous prime is 7643807. The next prime is 7643827. The reversal of 7643813 is 3183467.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7606564 + 37249 = 2758^2 + 193^2 .

It is a cyclic number.

It is not a de Polignac number, because 7643813 - 2¹² = 7639717 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7643813.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7643873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3821906 + 3821907.

It is an arithmetic number, because the mean of its divisors is an integer number (3821907).

Almost surely, 2^7643813 is an apocalyptic number.

It is an amenable number.

7643813 is a deficient number, since it is larger than the sum of its proper divisors (1).

7643813 is an equidigital number, since it uses as much as digits as its factorization.

7643813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 32.

The square root of 7643813 is about 2764.7446536706. The cubic root of 7643813 is about 196.9866001347.

The spelling of 7643813 in words is "seven million, six hundred forty-three thousand, eight hundred thirteen".