13240145 has 4 divisors (see below), whose sum is σ = 15888180. Its totient is φ = 10592112.

The previous prime is 13240141. The next prime is 13240159. The reversal of 13240145 is 54104231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54104231 = 233 ⋅232207.

It can be written as a sum of positive squares in 2 ways, for example, as 10394176 + 2845969 = 3224^2 + 1687^2 .

It is a cyclic number.

It is not a de Polignac number, because 13240145 - 2² = 13240141 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13240141) 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, 1324010 + ... + 1324019.

It is an arithmetic number, because the mean of its divisors is an integer number (3972045).

Almost surely, 2^13240145 is an apocalyptic number.

It is an amenable number.

13240145 is a deficient number, since it is larger than the sum of its proper divisors (2648035).

13240145 is an equidigital number, since it uses as much as digits as its factorization.

13240145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2648034.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 13240145 is about 3638.7010044795. The cubic root of 13240145 is about 236.5724933349.

Adding to 13240145 its reverse (54104231), we get a palindrome (67344376).

It can be divided in two parts, 132 and 40145, that multiplied together give a triangular number (5299140 = T₃₂₅₅).

The spelling of 13240145 in words is "thirteen million, two hundred forty thousand, one hundred forty-five".