13722257 has 4 divisors (see below), whose sum is σ = 13729716. Its totient is φ = 13714800.

The previous prime is 13722239. The next prime is 13722277. The reversal of 13722257 is 75222731.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 4456321 + 9265936 = 2111^2 + 3044^2 .

It is a cyclic number.

It is not a de Polignac number, because 13722257 - 2¹⁰ = 13721233 is a prime.

It is a Duffinian number.

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, 1223 + ... + 5379.

It is an arithmetic number, because the mean of its divisors is an integer number (3432429).

Almost surely, 2^13722257 is an apocalyptic number.

It is an amenable number.

13722257 is a deficient number, since it is larger than the sum of its proper divisors (7459).

13722257 is an equidigital number, since it uses as much as digits as its factorization.

13722257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7458.

The product of its digits is 5880, while the sum is 29.

The square root of 13722257 is about 3704.3564893244. The cubic root of 13722257 is about 239.4097590793.

Adding to 13722257 its reverse (75222731), we get a palindrome (88944988).

The spelling of 13722257 in words is "thirteen million, seven hundred twenty-two thousand, two hundred fifty-seven".