13722657 has 8 divisors (see below), whose sum is σ = 19704384. Its totient is φ = 8444688.

The previous prime is 13722649. The next prime is 13722661. The reversal of 13722657 is 75622731.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13722657 - 2³ = 13722649 is a prime.

It is a super-2 number, since 2×13722657² = 376622630279298, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (13722647) 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, 175893 + ... + 175970.

It is an arithmetic number, because the mean of its divisors is an integer number (2463048).

Almost surely, 2^13722657 is an apocalyptic number.

It is an amenable number.

13722657 is a deficient number, since it is larger than the sum of its proper divisors (5981727).

13722657 is a wasteful number, since it uses less digits than its factorization.

13722657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351879.

The product of its digits is 17640, while the sum is 33.

The square root of 13722657 is about 3704.4104794150. The cubic root of 13722657 is about 239.4120852995.

The spelling of 13722657 in words is "thirteen million, seven hundred twenty-two thousand, six hundred fifty-seven".