7538643 has 16 divisors (see below), whose sum is σ = 12764160. Its totient is φ = 4307688.

The previous prime is 7538617. The next prime is 7538647. The reversal of 7538643 is 3468357.

It is a happy number.

7538643 is a `hidden beast` number, since 7 + 5 + 3 + 8 + 643 = 666.

It is not a de Polignac number, because 7538643 - 2¹³ = 7530451 is a prime.

It is a super-2 number, since 2×7538643² = 113662276562898, which contains 22 as substring.

7538643 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 7538598 and 7538607.

It is not an unprimeable number, because it can be changed into a prime (7538647) 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 in 15 ways as a sum of consecutive naturals, for example, 19755 + ... + 20132.

It is an arithmetic number, because the mean of its divisors is an integer number (797760).

Almost surely, 2^7538643 is an apocalyptic number.

7538643 is a deficient number, since it is larger than the sum of its proper divisors (5225517).

7538643 is a wasteful number, since it uses less digits than its factorization.

7538643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39903 (or 39897 counting only the distinct ones).

The product of its digits is 60480, while the sum is 36.

The square root of 7538643 is about 2745.6589373045. The cubic root of 7538643 is about 196.0789890568.

The spelling of 7538643 in words is "seven million, five hundred thirty-eight thousand, six hundred forty-three".