18107813 has 8 divisors (see below), whose sum is σ = 18771456. Its totient is φ = 17449200.

The previous prime is 18107801. The next prime is 18107849. The reversal of 18107813 is 31870181.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18107813 - 2¹² = 18103717 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 (18307813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7043 + ... + 9263.

It is an arithmetic number, because the mean of its divisors is an integer number (2346432).

Almost surely, 2^18107813 is an apocalyptic number.

It is an amenable number.

18107813 is a deficient number, since it is larger than the sum of its proper divisors (663643).

18107813 is a wasteful number, since it uses less digits than its factorization.

18107813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2515.

The product of its (nonzero) digits is 1344, while the sum is 29.

The square root of 18107813 is about 4255.3276019597. The cubic root of 18107813 is about 262.5963389396.

Adding to 18107813 its reverse (31870181), we get a palindrome (49977994).

The spelling of 18107813 in words is "eighteen million, one hundred seven thousand, eight hundred thirteen".