7638643 has 2 divisors, whose sum is σ = 7638644. Its totient is φ = 7638642.

The previous prime is 7638641. The next prime is 7638689. The reversal of 7638643 is 3468367.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 7638643 - 2¹ = 7638641 is a prime.

Together with 7638641, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (7638641) 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, 3819321 + 3819322.

It is an arithmetic number, because the mean of its divisors is an integer number (3819322).

Almost surely, 2^7638643 is an apocalyptic number.

7638643 is a deficient number, since it is larger than the sum of its proper divisors (1).

7638643 is an equidigital number, since it uses as much as digits as its factorization.

7638643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 37.

The square root of 7638643 is about 2763.8095086312. The cubic root of 7638643 is about 196.9421785693.

It can be divided in two parts, 7638 and 643, that added together give a square (8281 = 91²).

The spelling of 7638643 in words is "seven million, six hundred thirty-eight thousand, six hundred forty-three".