13140445 has 4 divisors (see below), whose sum is σ = 15768540. Its totient is φ = 10512352.

The previous prime is 13140433. The next prime is 13140461. The reversal of 13140445 is 54404131.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5861241 + 7279204 = 2421^2 + 2698^2 .

It is a cyclic number.

It is not a de Polignac number, because 13140445 - 2⁷ = 13140317 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1314040 + ... + 1314049.

It is an arithmetic number, because the mean of its divisors is an integer number (3942135).

Almost surely, 2^13140445 is an apocalyptic number.

It is an amenable number.

13140445 is a deficient number, since it is larger than the sum of its proper divisors (2628095).

13140445 is an equidigital number, since it uses as much as digits as its factorization.

13140445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2628094.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 13140445 is about 3624.9751723288. The cubic root of 13140445 is about 235.9771894548.

Adding to 13140445 its reverse (54404131), we get a palindrome (67544576).

The spelling of 13140445 in words is "thirteen million, one hundred forty thousand, four hundred forty-five".