18682913 has 4 divisors (see below), whose sum is σ = 18701460. Its totient is φ = 18664368.

The previous prime is 18682907. The next prime is 18682919. The reversal of 18682913 is 31928681.

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 (18682907) and next prime (18682919).

It can be written as a sum of positive squares in 2 ways, for example, as 4635409 + 14047504 = 2153^2 + 3748^2 .

It is a cyclic number.

It is not a de Polignac number, because 18682913 - 2⁶ = 18682849 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18682919) 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, 7670 + ... + 9807.

It is an arithmetic number, because the mean of its divisors is an integer number (4675365).

Almost surely, 2^18682913 is an apocalyptic number.

It is an amenable number.

18682913 is a deficient number, since it is larger than the sum of its proper divisors (18547).

18682913 is a wasteful number, since it uses less digits than its factorization.

18682913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18546.

The product of its digits is 20736, while the sum is 38.

The square root of 18682913 is about 4322.3735377683. The cubic root of 18682913 is about 265.3474166507.

The spelling of 18682913 in words is "eighteen million, six hundred eighty-two thousand, nine hundred thirteen".