13209156 has 60 divisors (see below), whose sum is σ = 35167440. Its totient is φ = 4322160.

The previous prime is 13209151. The next prime is 13209167. The reversal of 13209156 is 65190231.

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

It is not an unprimeable number, because it can be changed into a prime (13209151) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 18771 + ... + 19461.

It is an arithmetic number, because the mean of its divisors is an integer number (586124).

Almost surely, 2^13209156 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13209156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17583720).

13209156 is an abundant number, since it is smaller than the sum of its proper divisors (21958284).

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

13209156 is a wasteful number, since it uses less digits than its factorization.

13209156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 766 (or 755 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 13209156 is about 3634.4402595173. The cubic root of 13209156 is about 236.3877805532.

Adding to 13209156 its reverse (65190231), we get a palindrome (78399387).

The spelling of 13209156 in words is "thirteen million, two hundred nine thousand, one hundred fifty-six".