13720565 has 8 divisors (see below), whose sum is σ = 17331360. Its totient is φ = 10398672.

The previous prime is 13720543. The next prime is 13720589. The reversal of 13720565 is 56502731.

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

It is a cyclic number.

It is not a de Polignac number, because 13720565 - 2⁶ = 13720501 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72119 + ... + 72308.

It is an arithmetic number, because the mean of its divisors is an integer number (2166420).

Almost surely, 2^13720565 is an apocalyptic number.

It is an amenable number.

13720565 is a deficient number, since it is larger than the sum of its proper divisors (3610795).

13720565 is a wasteful number, since it uses less digits than its factorization.

13720565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144451.

The product of its (nonzero) digits is 6300, while the sum is 29.

The square root of 13720565 is about 3704.1281025364. The cubic root of 13720565 is about 239.3999186679.

It can be divided in two parts, 137 and 20565, that added together give a palindrome (20702).

The spelling of 13720565 in words is "thirteen million, seven hundred twenty thousand, five hundred sixty-five".