189985000 has 40 divisors (see below), whose sum is σ = 445146570. Its totient is φ = 75992000.

The previous prime is 189984997. The next prime is 189985001. The reversal of 189985000 is 589981.

189985000 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 5 ways, for example, as 29354724 + 160630276 = 5418^2 + 12674^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (189985001) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 13999 + ... + 23998.

Almost surely, 2^189985000 is an apocalyptic number.

189985000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

189985000 is an abundant number, since it is smaller than the sum of its proper divisors (255161570).

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

189985000 is an equidigital number, since it uses as much as digits as its factorization.

189985000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38023 (or 38004 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 40.

The square root of 189985000 is about 13783.5046341633. The cubic root of 189985000 is about 574.8745788198.

The spelling of 189985000 in words is "one hundred eighty-nine million, nine hundred eighty-five thousand".