18861700 has 72 divisors (see below), whose sum is σ = 48121920. Its totient is φ = 6326400.

The previous prime is 18861683. The next prime is 18861707. The reversal of 18861700 is 716881.

It is a super-3 number, since 3×18861700³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (18861707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13641 + ... + 14959.

It is an arithmetic number, because the mean of its divisors is an integer number (668360).

Almost surely, 2^18861700 is an apocalyptic number.

18861700 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 18861700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24060960).

18861700 is an abundant number, since it is smaller than the sum of its proper divisors (29260220).

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

18861700 is a wasteful number, since it uses less digits than its factorization.

18861700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1357 (or 1350 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 31.

The square root of 18861700 is about 4343.0058715134. The cubic root of 18861700 is about 266.1911490932.

The spelling of 18861700 in words is "eighteen million, eight hundred sixty-one thousand, seven hundred".