18887700 has 144 divisors (see below), whose sum is σ = 61246080. Its totient is φ = 4462080.

The previous prime is 18887699. The next prime is 18887741. The reversal of 18887700 is 778881.

It is a happy number.

It is a super-2 number, since 2×18887700² = 713490422580000, which contains 22 as substring.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 113017 + ... + 113183.

It is an arithmetic number, because the mean of its divisors is an integer number (425320).

Almost surely, 2^18887700 is an apocalyptic number.

18887700 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 18887700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30623040).

18887700 is an abundant number, since it is smaller than the sum of its proper divisors (42358380).

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

18887700 is a wasteful number, since it uses less digits than its factorization.

18887700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226 (or 219 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 39.

The square root of 18887700 is about 4345.9981592265. The cubic root of 18887700 is about 266.3134037544.

The spelling of 18887700 in words is "eighteen million, eight hundred eighty-seven thousand, seven hundred".