13881018 has 16 divisors (see below), whose sum is σ = 28286496. Its totient is φ = 4539600.

The previous prime is 13881017. The next prime is 13881037. The reversal of 13881018 is 81018831.

It is not an unprimeable number, because it can be changed into a prime (13881013) 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, 21508 + ... + 22143.

It is an arithmetic number, because the mean of its divisors is an integer number (1767906).

Almost surely, 2^13881018 is an apocalyptic number.

13881018 is an abundant number, since it is smaller than the sum of its proper divisors (14405478).

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

13881018 is a wasteful number, since it uses less digits than its factorization.

13881018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43709.

The product of its (nonzero) digits is 1536, while the sum is 30.

The square root of 13881018 is about 3725.7238222928. The cubic root of 13881018 is about 240.3295126599.

Adding to 13881018 its reverse (81018831), we get a palindrome (94899849).

The spelling of 13881018 in words is "thirteen million, eight hundred eighty-one thousand, eighteen".