13309776 has 60 divisors (see below), whose sum is σ = 39447252. Its totient is φ = 4174848.

The previous prime is 13309771. The next prime is 13309817. The reversal of 13309776 is 67790331.

It can be written as a sum of positive squares in 2 ways, for example, as 9000000 + 4309776 = 3000^2 + 2076^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 13309776.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13309771) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 271 + ... + 5166.

Almost surely, 2^13309776 is an apocalyptic number.

13309776 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 13309776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19723626).

13309776 is an abundant number, since it is smaller than the sum of its proper divisors (26137476).

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

13309776 is a wasteful number, since it uses less digits than its factorization.

13309776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5468 (or 5459 counting only the distinct ones).

The product of its (nonzero) digits is 23814, while the sum is 36.

The square root of 13309776 is about 3648.2565699249. The cubic root of 13309776 is about 236.9864864377.

The spelling of 13309776 in words is "thirteen million, three hundred nine thousand, seven hundred seventy-six".