13809136 has 40 divisors (see below), whose sum is σ = 30140928. Its totient is φ = 6072000.

The previous prime is 13809113. The next prime is 13809137. The reversal of 13809136 is 63190831.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a junction number, because it is equal to n+sod(n) for n = 13809098 and 13809107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13809137) 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 7 ways as a sum of consecutive naturals, for example, 4191 + ... + 6721.

Almost surely, 2^13809136 is an apocalyptic number.

13809136 is a gapful number since it is divisible by the number (16) 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 13809136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15070464).

13809136 is an abundant number, since it is smaller than the sum of its proper divisors (16331792).

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

13809136 is a wasteful number, since it uses less digits than its factorization.

13809136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2581 (or 2575 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 13809136 is about 3716.0645850146. The cubic root of 13809136 is about 239.9139506331.

Adding to 13809136 its reverse (63190831), we get a palindrome (76999967).

The spelling of 13809136 in words is "thirteen million, eight hundred nine thousand, one hundred thirty-six".