13638733 has 4 divisors (see below), whose sum is σ = 13692060. Its totient is φ = 13585408.

The previous prime is 13638707. The next prime is 13638739. The reversal of 13638733 is 33783631.

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

It can be written as a sum of positive squares in 2 ways, for example, as 13446889 + 191844 = 3667^2 + 438^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13638733 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 (13638739) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26278 + ... + 26791.

It is an arithmetic number, because the mean of its divisors is an integer number (3423015).

Almost surely, 2^13638733 is an apocalyptic number.

It is an amenable number.

13638733 is a deficient number, since it is larger than the sum of its proper divisors (53327).

13638733 is an equidigital number, since it uses as much as digits as its factorization.

13638733 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53326.

The product of its digits is 27216, while the sum is 34.

The square root of 13638733 is about 3693.0655287985. The cubic root of 13638733 is about 238.9230274470.

The spelling of 13638733 in words is "thirteen million, six hundred thirty-eight thousand, seven hundred thirty-three".