186640013 has 4 divisors (see below), whose sum is σ = 213302880. Its totient is φ = 159977148.

The previous prime is 186640007. The next prime is 186640019. The reversal of 186640013 is 310046681.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 310046681 = 7 ⋅44292383.

It is an interprime number because it is at equal distance from previous prime (186640007) and next prime (186640019).

It is a cyclic number.

It is not a de Polignac number, because 186640013 - 2¹⁸ = 186377869 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (186640019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13331423 + ... + 13331436.

It is an arithmetic number, because the mean of its divisors is an integer number (53325720).

Almost surely, 2^186640013 is an apocalyptic number.

It is an amenable number.

186640013 is a deficient number, since it is larger than the sum of its proper divisors (26662867).

186640013 is an equidigital number, since it uses as much as digits as its factorization.

186640013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26662866.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 186640013 is about 13661.6255621357. The cubic root of 186640013 is about 571.4807227968.

Adding to 186640013 its reverse (310046681), we get a palindrome (496686694).

The spelling of 186640013 in words is "one hundred eighty-six million, six hundred forty thousand, thirteen".