13140385 has 4 divisors (see below), whose sum is σ = 15768468. Its totient is φ = 10512304.

The previous prime is 13140367. The next prime is 13140389. The reversal of 13140385 is 58304131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58304131 = 1091 ⋅53441.

It can be written as a sum of positive squares in 2 ways, for example, as 8946081 + 4194304 = 2991^2 + 2048^2 .

It is a cyclic number.

It is not a de Polignac number, because 13140385 - 2⁵ = 13140353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13140389) 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, 1314034 + ... + 1314043.

It is an arithmetic number, because the mean of its divisors is an integer number (3942117).

Almost surely, 2^13140385 is an apocalyptic number.

It is an amenable number.

13140385 is a deficient number, since it is larger than the sum of its proper divisors (2628083).

13140385 is an equidigital number, since it uses as much as digits as its factorization.

13140385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2628082.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 13140385 is about 3624.9668964006. The cubic root of 13140385 is about 235.9768302926.

It can be divided in two parts, 13 and 140385, that multiplied together give a triangular number (1825005 = T₁₉₁₀).

The spelling of 13140385 in words is "thirteen million, one hundred forty thousand, three hundred eighty-five".