18120504 has 64 divisors (see below), whose sum is σ = 50077440. Its totient is φ = 5434880.

The previous prime is 18120503. The next prime is 18120517. The reversal of 18120504 is 40502181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18120503) 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 15 ways as a sum of consecutive naturals, for example, 8419 + ... + 10349.

It is an arithmetic number, because the mean of its divisors is an integer number (782460).

Almost surely, 2^18120504 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18120504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25038720).

18120504 is an abundant number, since it is smaller than the sum of its proper divisors (31956936).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18120504 is a wasteful number, since it uses less digits than its factorization.

18120504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1980 (or 1976 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 18120504 is about 4256.8185303111. The cubic root of 18120504 is about 262.6576721677.

Adding to 18120504 its reverse (40502181), we get a palindrome (58622685).

The spelling of 18120504 in words is "eighteen million, one hundred twenty thousand, five hundred four".