18993700 has 72 divisors (see below), whose sum is σ = 46497024. Its totient is φ = 6672000.

The previous prime is 18993697. The next prime is 18993721. The reversal of 18993700 is 739981.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 18993700.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33822 + ... + 34378.

It is an arithmetic number, because the mean of its divisors is an integer number (645792).

Almost surely, 2^18993700 is an apocalyptic number.

18993700 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 18993700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23248512).

18993700 is an abundant number, since it is smaller than the sum of its proper divisors (27503324).

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

18993700 is a wasteful number, since it uses less digits than its factorization.

18993700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 613 (or 606 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 18993700 is about 4358.1762240644. The cubic root of 18993700 is about 266.8106687515.

The spelling of 18993700 in words is "eighteen million, nine hundred ninety-three thousand, seven hundred".