13638743 has 4 divisors (see below), whose sum is σ = 14441040. Its totient is φ = 12836448.

The previous prime is 13638739. The next prime is 13638749. The reversal of 13638743 is 34783631.

It is a happy number.

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 13638743 - 2² = 13638739 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13638749) 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 in 3 ways as a sum of consecutive naturals, for example, 401123 + ... + 401156.

It is an arithmetic number, because the mean of its divisors is an integer number (3610260).

Almost surely, 2^13638743 is an apocalyptic number.

13638743 is a deficient number, since it is larger than the sum of its proper divisors (802297).

13638743 is an equidigital number, since it uses as much as digits as its factorization.

13638743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 802296.

The product of its digits is 36288, while the sum is 35.

The square root of 13638743 is about 3693.0668826871. The cubic root of 13638743 is about 238.9230858402.

The spelling of 13638743 in words is "thirteen million, six hundred thirty-eight thousand, seven hundred forty-three".