13720231 has 4 divisors (see below), whose sum is σ = 15680272. Its totient is φ = 11760192.

The previous prime is 13720211. The next prime is 13720247. The reversal of 13720231 is 13202731.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13720231 - 2¹⁵ = 13687463 is a prime.

It is a super-2 number, since 2×13720231² = 376489477386722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13720199 and 13720208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13720211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 980010 + ... + 980023.

It is an arithmetic number, because the mean of its divisors is an integer number (3920068).

Almost surely, 2^13720231 is an apocalyptic number.

13720231 is a deficient number, since it is larger than the sum of its proper divisors (1960041).

13720231 is an equidigital number, since it uses as much as digits as its factorization.

13720231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1960040.

The product of its (nonzero) digits is 252, while the sum is 19.

The square root of 13720231 is about 3704.0830174282. The cubic root of 13720231 is about 239.3979760797.

Adding to 13720231 its reverse (13202731), we get a palindrome (26922962).

The spelling of 13720231 in words is "thirteen million, seven hundred twenty thousand, two hundred thirty-one".