13727721 has 16 divisors (see below), whose sum is σ = 22149504. Its totient is φ = 7382784.

The previous prime is 13727719. The next prime is 13727729. The reversal of 13727721 is 12772731.

It is not a de Polignac number, because 13727721 - 2¹ = 13727719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13727729) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18870 + ... + 19583.

It is an arithmetic number, because the mean of its divisors is an integer number (1384344).

Almost surely, 2^13727721 is an apocalyptic number.

It is an amenable number.

13727721 is a deficient number, since it is larger than the sum of its proper divisors (8421783).

13727721 is a wasteful number, since it uses less digits than its factorization.

13727721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38480.

The product of its digits is 4116, while the sum is 30.

The square root of 13727721 is about 3705.0939259349. The cubic root of 13727721 is about 239.4415313389.

The spelling of 13727721 in words is "thirteen million, seven hundred twenty-seven thousand, seven hundred twenty-one".