13720457 has 4 divisors (see below), whose sum is σ = 13799940. Its totient is φ = 13640976.

The previous prime is 13720439. The next prime is 13720463. The reversal of 13720457 is 75402731.

13720457 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75402731 = 41 ⋅1839091.

It can be written as a sum of positive squares in 2 ways, for example, as 12418576 + 1301881 = 3524^2 + 1141^2 .

It is a cyclic number.

It is not a de Polignac number, because 13720457 - 2²⁰ = 12671881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13720417) 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, 39482 + ... + 39827.

It is an arithmetic number, because the mean of its divisors is an integer number (3449985).

Almost surely, 2^13720457 is an apocalyptic number.

It is an amenable number.

13720457 is a deficient number, since it is larger than the sum of its proper divisors (79483).

13720457 is an equidigital number, since it uses as much as digits as its factorization.

13720457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79482.

The product of its (nonzero) digits is 5880, while the sum is 29.

The square root of 13720457 is about 3704.1135241782. The cubic root of 13720457 is about 239.3992905291.

The spelling of 13720457 in words is "thirteen million, seven hundred twenty thousand, four hundred fifty-seven".