7543643 has 2 divisors, whose sum is σ = 7543644. Its totient is φ = 7543642.

The previous prime is 7543639. The next prime is 7543651. The reversal of 7543643 is 3463457.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 7543643 - 2² = 7543639 is a prime.

It is a super-2 number, since 2×7543643² = 113813099422898, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (7543603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3771821 + 3771822.

It is an arithmetic number, because the mean of its divisors is an integer number (3771822).

Almost surely, 2^7543643 is an apocalyptic number.

7543643 is a deficient number, since it is larger than the sum of its proper divisors (1).

7543643 is an equidigital number, since it uses as much as digits as its factorization.

7543643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 32.

The square root of 7543643 is about 2746.5693146178. The cubic root of 7543643 is about 196.1223292298.

The spelling of 7543643 in words is "seven million, five hundred forty-three thousand, six hundred forty-three".