18786013 has 4 divisors (see below), whose sum is σ = 19104480. Its totient is φ = 18467548.

The previous prime is 18786011. The next prime is 18786017. The reversal of 18786013 is 31068781.

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: 31068781 = 19 ⋅1635199.

It is a cyclic number.

It is not a de Polignac number, because 18786013 - 2¹ = 18786011 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18786013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18786011) 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, 159145 + ... + 159262.

It is an arithmetic number, because the mean of its divisors is an integer number (4776120).

Almost surely, 2^18786013 is an apocalyptic number.

It is an amenable number.

18786013 is a deficient number, since it is larger than the sum of its proper divisors (318467).

18786013 is an equidigital number, since it uses as much as digits as its factorization.

18786013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318466.

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 18786013 is about 4334.2834471225. The cubic root of 18786013 is about 265.8346202860.

The spelling of 18786013 in words is "eighteen million, seven hundred eighty-six thousand, thirteen".