13723145 has 4 divisors (see below), whose sum is σ = 16467780. Its totient is φ = 10978512.

The previous prime is 13723139. The next prime is 13723147. The reversal of 13723145 is 54132731.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54132731 = 23 ⋅2353597.

It can be written as a sum of positive squares in 2 ways, for example, as 6210064 + 7513081 = 2492^2 + 2741^2 .

It is a cyclic number.

It is not a de Polignac number, because 13723145 - 2⁶ = 13723081 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13723147) 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, 1372310 + ... + 1372319.

It is an arithmetic number, because the mean of its divisors is an integer number (4116945).

Almost surely, 2^13723145 is an apocalyptic number.

It is an amenable number.

13723145 is a deficient number, since it is larger than the sum of its proper divisors (2744635).

13723145 is an equidigital number, since it uses as much as digits as its factorization.

13723145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2744634.

The product of its digits is 2520, while the sum is 26.

The square root of 13723145 is about 3704.4763462600. The cubic root of 13723145 is about 239.4149232269.

Adding to 13723145 its reverse (54132731), we get a palindrome (67855876).

The spelling of 13723145 in words is "thirteen million, seven hundred twenty-three thousand, one hundred forty-five".