13881318 has 16 divisors (see below), whose sum is σ = 30286656. Its totient is φ = 4206440.

The previous prime is 13881317. The next prime is 13881319. The reversal of 13881318 is 81318831.

It is an interprime number because it is at equal distance from previous prime (13881317) and next prime (13881319).

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13881311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105096 + ... + 105227.

It is an arithmetic number, because the mean of its divisors is an integer number (1892916).

Almost surely, 2^13881318 is an apocalyptic number.

13881318 is an abundant number, since it is smaller than the sum of its proper divisors (16405338).

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

13881318 is a wasteful number, since it uses less digits than its factorization.

13881318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210339.

The product of its digits is 4608, while the sum is 33.

The square root of 13881318 is about 3725.7640827084. The cubic root of 13881318 is about 240.3312440011.

It can be divided in two parts, 138813 and 18, that added together give a palindrome (138831).

The spelling of 13881318 in words is "thirteen million, eight hundred eighty-one thousand, three hundred eighteen".