13138643 has 4 divisors (see below), whose sum is σ = 15015600. Its totient is φ = 11261688.

The previous prime is 13138639. The next prime is 13138673. The reversal of 13138643 is 34683131.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13138643 - 2² = 13138639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13138673) 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 3 ways as a sum of consecutive naturals, for example, 938468 + ... + 938481.

It is an arithmetic number, because the mean of its divisors is an integer number (3753900).

Almost surely, 2^13138643 is an apocalyptic number.

13138643 is a deficient number, since it is larger than the sum of its proper divisors (1876957).

13138643 is an equidigital number, since it uses as much as digits as its factorization.

13138643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1876956.

The product of its digits is 5184, while the sum is 29.

The square root of 13138643 is about 3624.7266103804. The cubic root of 13138643 is about 235.9664021404.

The spelling of 13138643 in words is "thirteen million, one hundred thirty-eight thousand, six hundred forty-three".