188890000 has 100 divisors (see below), whose sum is σ = 492839116. Its totient is φ = 69696000.

The previous prime is 188889959. The next prime is 188890003. The reversal of 188890000 is 98881.

It can be written as a sum of positive squares in 10 ways, for example, as 125081856 + 63808144 = 11184^2 + 7988^2 .

It is a tau number, because it is divible by the number of its divisors (100).

It is not an unprimeable number, because it can be changed into a prime (188890003) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 129274 + ... + 130726.

Almost surely, 2^188890000 is an apocalyptic number.

188890000 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 188890000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (246419558).

188890000 is an abundant number, since it is smaller than the sum of its proper divisors (303949116).

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

188890000 is a wasteful number, since it uses less digits than its factorization.

188890000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1494 (or 1473 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 34.

The square root of 188890000 is about 13743.7258412703. The cubic root of 188890000 is about 573.7679986063.

The spelling of 188890000 in words is "one hundred eighty-eight million, eight hundred ninety thousand".