18043100 has 36 divisors (see below), whose sum is σ = 39752664. Its totient is φ = 7106880.

The previous prime is 18043099. The next prime is 18043163. The reversal of 18043100 is 134081.

It is a happy number.

It is a super-2 number, since 2×18043100² = 651106915220000, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 5354 + ... + 8046.

Almost surely, 2^18043100 is an apocalyptic number.

18043100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18043100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19876332).

18043100 is an abundant number, since it is smaller than the sum of its proper divisors (21709564).

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

18043100 is a wasteful number, since it uses less digits than its factorization.

18043100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2774 (or 2767 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 18043100 is about 4247.7170338901. The cubic root of 18043100 is about 262.2831466798.

Adding to 18043100 its reverse (134081), we get a palindrome (18177181).

The spelling of 18043100 in words is "eighteen million, forty-three thousand, one hundred".