13722216 has 16 divisors (see below), whose sum is σ = 34305600. Its totient is φ = 4574064.

The previous prime is 13722209. The next prime is 13722217. The reversal of 13722216 is 61222731.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 571759 = 13722216 / (1 + 3 + 7 + 2 + 2 + 2 + 1 + 6).

It is not an unprimeable number, because it can be changed into a prime (13722217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 285856 + ... + 285903.

It is an arithmetic number, because the mean of its divisors is an integer number (2144100).

Almost surely, 2^13722216 is an apocalyptic number.

It is an amenable number.

13722216 is an abundant number, since it is smaller than the sum of its proper divisors (20583384).

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

13722216 is a wasteful number, since it uses less digits than its factorization.

13722216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 571768 (or 571764 counting only the distinct ones).

The product of its digits is 1008, while the sum is 24.

The square root of 13722216 is about 3704.3509552957. The cubic root of 13722216 is about 239.4095206392.

Adding to 13722216 its reverse (61222731), we get a palindrome (74944947).

The spelling of 13722216 in words is "thirteen million, seven hundred twenty-two thousand, two hundred sixteen".