18145100 has 36 divisors (see below), whose sum is σ = 39559968. Its totient is φ = 7224000.

The previous prime is 18145093. The next prime is 18145109. The reversal of 18145100 is 154181.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (18145109) 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 11 ways as a sum of consecutive naturals, for example, 41885 + ... + 42315.

It is an arithmetic number, because the mean of its divisors is an integer number (1098888).

Almost surely, 2^18145100 is an apocalyptic number.

18145100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18145100 is an abundant number, since it is smaller than the sum of its proper divisors (21414868).

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

18145100 is a wasteful number, since it uses less digits than its factorization.

18145100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 866 (or 859 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 20.

The square root of 18145100 is about 4259.7065626637. The cubic root of 18145100 is about 262.7764585495.

Adding to 18145100 its reverse (154181), we get a palindrome (18299281).

The spelling of 18145100 in words is "eighteen million, one hundred forty-five thousand, one hundred".