13209318 has 40 divisors (see below), whose sum is σ = 30065112. Its totient is φ = 4333824.

The previous prime is 13209311. The next prime is 13209331. The reversal of 13209318 is 81390231.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 13209291 and 13209300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13209311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 10246 + ... + 11462.

Almost surely, 2^13209318 is an apocalyptic number.

13209318 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 13209318, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15032556).

13209318 is an abundant number, since it is smaller than the sum of its proper divisors (16855794).

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

13209318 is a wasteful number, since it uses less digits than its factorization.

13209318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1298 (or 1289 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 13209318 is about 3634.4625462371. The cubic root of 13209318 is about 236.3887469198.

Adding to 13209318 its reverse (81390231), we get a palindrome (94599549).

The spelling of 13209318 in words is "thirteen million, two hundred nine thousand, three hundred eighteen".