13731216 has 40 divisors (see below), whose sum is σ = 35649504. Its totient is φ = 4554240.

The previous prime is 13731209. The next prime is 13731217. The reversal of 13731216 is 61213731.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (13731217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10975 + ... + 12161.

Almost surely, 2^13731216 is an apocalyptic number.

13731216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

13731216 is an abundant number, since it is smaller than the sum of its proper divisors (21918288).

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

13731216 is a wasteful number, since it uses less digits than its factorization.

13731216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1439 (or 1433 counting only the distinct ones).

The product of its digits is 756, while the sum is 24.

The square root of 13731216 is about 3705.5655438813. The cubic root of 13731216 is about 239.4618497672.

Adding to 13731216 its reverse (61213731), we get a palindrome (74944947).

The spelling of 13731216 in words is "thirteen million, seven hundred thirty-one thousand, two hundred sixteen".