18998700 has 144 divisors (see below), whose sum is σ = 64162560. Its totient is φ = 4250880.

The previous prime is 18998699. The next prime is 18998719. The reversal of 18998700 is 789981.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 174246 + ... + 174354.

Almost surely, 2^18998700 is an apocalyptic number.

18998700 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 18998700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32081280).

18998700 is an abundant number, since it is smaller than the sum of its proper divisors (45163860).

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

18998700 is a wasteful number, since it uses less digits than its factorization.

18998700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216 (or 209 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 42.

The square root of 18998700 is about 4358.7498207628. The cubic root of 18998700 is about 266.8340789051.

It can be divided in two parts, 189 and 98700, that added together give a palindrome (98889).

The spelling of 18998700 in words is "eighteen million, nine hundred ninety-eight thousand, seven hundred".