13720549 has 4 divisors (see below), whose sum is σ = 13731264. Its totient is φ = 13709836.

The previous prime is 13720543. The next prime is 13720589. The reversal of 13720549 is 94502731.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 13720549 - 2⁵ = 13720517 is a prime.

It is a super-2 number, since 2×13720549² = 376506929722802, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13720549.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13720543) 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, 3127 + ... + 6100.

It is an arithmetic number, because the mean of its divisors is an integer number (3432816).

Almost surely, 2^13720549 is an apocalyptic number.

It is an amenable number.

13720549 is a deficient number, since it is larger than the sum of its proper divisors (10715).

13720549 is an equidigital number, since it uses as much as digits as its factorization.

13720549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10714.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 13720549 is about 3704.1259427833. The cubic root of 13720549 is about 239.3998256105.

The spelling of 13720549 in words is "thirteen million, seven hundred twenty thousand, five hundred forty-nine".