18123313 has 8 divisors (see below), whose sum is σ = 20147456. Its totient is φ = 16189200.

The previous prime is 18123263. The next prime is 18123323. The reversal of 18123313 is 31332181.

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 18123313 - 2¹³ = 18115121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18123323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22083 + ... + 22888.

It is an arithmetic number, because the mean of its divisors is an integer number (2518432).

Almost surely, 2^18123313 is an apocalyptic number.

18123313 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

18123313 is a deficient number, since it is larger than the sum of its proper divisors (2024143).

18123313 is a wasteful number, since it uses less digits than its factorization.

18123313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45015.

The product of its digits is 432, while the sum is 22.

The square root of 18123313 is about 4257.1484587691. The cubic root of 18123313 is about 262.6712436681.

Adding to 18123313 its reverse (31332181), we get a palindrome (49455494).

The spelling of 18123313 in words is "eighteen million, one hundred twenty-three thousand, three hundred thirteen".