13815138 has 8 divisors (see below), whose sum is σ = 27630288. Its totient is φ = 4605044.

The previous prime is 13815079. The next prime is 13815149. The reversal of 13815138 is 83151831.

13815138 is digitally balanced in base 2 and base 4, because in such bases 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.

13815138 is an admirable number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1151256 + ... + 1151267.

It is an arithmetic number, because the mean of its divisors is an integer number (3453786).

Almost surely, 2^13815138 is an apocalyptic number.

13815138 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13815138 is a wasteful number, since it uses less digits than its factorization.

13815138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2302528.

The product of its digits is 2880, while the sum is 30.

The square root of 13815138 is about 3716.8720720520. The cubic root of 13815138 is about 239.9487043150.

Adding to 13815138 its reverse (83151831), we get a palindrome (96966969).

The spelling of 13815138 in words is "thirteen million, eight hundred fifteen thousand, one hundred thirty-eight".