13281638 has 8 divisors (see below), whose sum is σ = 20174880. Its totient is φ = 6556680.

The previous prime is 13281637. The next prime is 13281647. The reversal of 13281638 is 83618231.

It is a happy number.

13281638 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a nialpdrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13281637) 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, 41873 + ... + 42188.

It is an arithmetic number, because the mean of its divisors is an integer number (2521860).

Almost surely, 2^13281638 is an apocalyptic number.

13281638 is a deficient number, since it is larger than the sum of its proper divisors (6893242).

13281638 is an equidigital number, since it uses as much as digits as its factorization.

13281638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84142.

The product of its digits is 6912, while the sum is 32.

The square root of 13281638 is about 3644.3981670504. The cubic root of 13281638 is about 236.8193654078.

Adding to 13281638 its reverse (83618231), we get a palindrome (96899869).

The spelling of 13281638 in words is "thirteen million, two hundred eighty-one thousand, six hundred thirty-eight".