189997500 has 360 divisors, whose sum is σ = 717970176. Its totient is φ = 38640000.

The previous prime is 189997487. The next prime is 189997501. The reversal of 189997500 is 5799981.

189997500 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 189997500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189997501) by changing a digit.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 4042477 + ... + 4042523.

Almost surely, 2^189997500 is an apocalyptic number.

189997500 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 189997500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (358985088).

189997500 is an abundant number, since it is smaller than the sum of its proper divisors (527972676).

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

189997500 is a wasteful number, since it uses less digits than its factorization.

189997500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99 (or 75 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 48.

The square root of 189997500 is about 13783.9580672607. The cubic root of 189997500 is about 574.8871864373.

It can be divided in two parts, 1899 and 97500, that added together give a palindrome (99399).

The spelling of 189997500 in words is "one hundred eighty-nine million, nine hundred ninety-seven thousand, five hundred".