18125500 has 24 divisors (see below), whose sum is σ = 39587184. Its totient is φ = 7250000.

The previous prime is 18125477. The next prime is 18125507. The reversal of 18125500 is 552181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18125507) 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, 17626 + ... + 18625.

It is an arithmetic number, because the mean of its divisors is an integer number (1649466).

Almost surely, 2^18125500 is an apocalyptic number.

18125500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18125500 is an abundant number, since it is smaller than the sum of its proper divisors (21461684).

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

18125500 is a wasteful number, since it uses less digits than its factorization.

18125500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36270 (or 36258 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 22.

The square root of 18125500 is about 4257.4053130986. The cubic root of 18125500 is about 262.6818090451.

Adding to 18125500 its reverse (552181), we get a palindrome (18677681).

The spelling of 18125500 in words is "eighteen million, one hundred twenty-five thousand, five hundred".