18682613 has 4 divisors (see below), whose sum is σ = 18892620. Its totient is φ = 18472608.

The previous prime is 18682607. The next prime is 18682619. The reversal of 18682613 is 31628681.

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

It is an interprime number because it is at equal distance from previous prime (18682607) and next prime (18682619).

It can be written as a sum of positive squares in 2 ways, for example, as 1435204 + 17247409 = 1198^2 + 4153^2 .

It is a cyclic number.

It is not a de Polignac number, because 18682613 - 2¹⁶ = 18617077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18682619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104870 + ... + 105047.

It is an arithmetic number, because the mean of its divisors is an integer number (4723155).

Almost surely, 2^18682613 is an apocalyptic number.

It is an amenable number.

18682613 is a deficient number, since it is larger than the sum of its proper divisors (210007).

18682613 is an equidigital number, since it uses as much as digits as its factorization.

18682613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210006.

The product of its digits is 13824, while the sum is 35.

The square root of 18682613 is about 4322.3388344738. The cubic root of 18682613 is about 265.3459963752.

The spelling of 18682613 in words is "eighteen million, six hundred eighty-two thousand, six hundred thirteen".