13181868 has 108 divisors (see below), whose sum is σ = 40676272. Its totient is φ = 3525120.

The previous prime is 13181843. The next prime is 13181873. The reversal of 13181868 is 86818131.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 72738 + ... + 72918.

Almost surely, 2^13181868 is an apocalyptic number.

13181868 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13181868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20338136).

13181868 is an abundant number, since it is smaller than the sum of its proper divisors (27494404).

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

13181868 is a wasteful number, since it uses less digits than its factorization.

13181868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232 (or 210 counting only the distinct ones).

The product of its digits is 9216, while the sum is 36.

The square root of 13181868 is about 3630.6842330338. The cubic root of 13181868 is about 236.2248885714.

Adding to 13181868 its reverse (86818131), we get a palindrome (99999999).

The spelling of 13181868 in words is "thirteen million, one hundred eighty-one thousand, eight hundred sixty-eight".