18493900 has 36 divisors (see below), whose sum is σ = 40657120. Its totient is φ = 7300800.

The previous prime is 18493883. The next prime is 18493903. The reversal of 18493900 is 939481.

It is not an unprimeable number, because it can be changed into a prime (18493903) 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 11 ways as a sum of consecutive naturals, for example, 6730 + ... + 9070.

Almost surely, 2^18493900 is an apocalyptic number.

18493900 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 18493900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20328560).

18493900 is an abundant number, since it is smaller than the sum of its proper divisors (22163220).

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

18493900 is a wasteful number, since it uses less digits than its factorization.

18493900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2434 (or 2427 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 18493900 is about 4300.4534644616. The cubic root of 18493900 is about 264.4495516175.

The spelling of 18493900 in words is "eighteen million, four hundred ninety-three thousand, nine hundred".