189388530 has 80 divisors (see below), whose sum is σ = 517728024. Its totient is φ = 49662720.

The previous prime is 189388513. The next prime is 189388603. The reversal of 189388530 is 35883981.

189388530 is a `hidden beast` number, since 1 + 89 + 38 + 8 + 530 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 70207641 + 119180889 = 8379^2 + 10917^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 47494 + ... + 51326.

Almost surely, 2^189388530 is an apocalyptic number.

189388530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 189388530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (258864012).

189388530 is an abundant number, since it is smaller than the sum of its proper divisors (328339494).

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

189388530 is a wasteful number, since it uses less digits than its factorization.

189388530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3913 (or 3904 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The square root of 189388530 is about 13761.8505296345. The cubic root of 189388530 is about 574.2723296693.

The spelling of 189388530 in words is "one hundred eighty-nine million, three hundred eighty-eight thousand, five hundred thirty".