18669800 has 48 divisors (see below), whose sum is σ = 43693260. Its totient is φ = 7418880.

The previous prime is 18669787. The next prime is 18669809. The reversal of 18669800 is 896681.

It can be written as a sum of positive squares in 6 ways, for example, as 2137444 + 16532356 = 1462^2 + 4066^2 .

It is a super-2 number, since 2×18669800² = 697122864080000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18669809) 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, 55232 + ... + 55568.

Almost surely, 2^18669800 is an apocalyptic number.

18669800 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 18669800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21846630).

18669800 is an abundant number, since it is smaller than the sum of its proper divisors (25023460).

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

18669800 is a wasteful number, since it uses less digits than its factorization.

18669800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 630 (or 621 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 18669800 is about 4320.8563965955. The cubic root of 18669800 is about 265.2853222110.

The spelling of 18669800 in words is "eighteen million, six hundred sixty-nine thousand, eight hundred".