18120113 has 24 divisors (see below), whose sum is σ = 22063104. Its totient is φ = 14791040.

The previous prime is 18120077. The next prime is 18120119. The reversal of 18120113 is 31102181.

It is not a de Polignac number, because 18120113 - 2⁶ = 18120049 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18120091 and 18120100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18120119) 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 23 ways as a sum of consecutive naturals, for example, 47120 + ... + 47502.

It is an arithmetic number, because the mean of its divisors is an integer number (919296).

Almost surely, 2^18120113 is an apocalyptic number.

It is an amenable number.

18120113 is a deficient number, since it is larger than the sum of its proper divisors (3942991).

18120113 is a wasteful number, since it uses less digits than its factorization.

18120113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445 (or 434 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 17.

The square root of 18120113 is about 4256.7726037457. The cubic root of 18120113 is about 262.6557829655.

Adding to 18120113 its reverse (31102181), we get a palindrome (49222294).

The spelling of 18120113 in words is "eighteen million, one hundred twenty thousand, one hundred thirteen".