188530290 has 48 divisors (see below), whose sum is σ = 527888088. Its totient is φ = 46407168.

The previous prime is 188530271. The next prime is 188530297. The reversal of 188530290 is 92035881.

188530290 is digitally balanced in base 3, 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 4 ways, for example, as 163098441 + 25431849 = 12771^2 + 5043^2 .

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (188530297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 79399 + ... + 81738.

Almost surely, 2^188530290 is an apocalyptic number.

188530290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

188530290 is an abundant number, since it is smaller than the sum of its proper divisors (339357798).

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

188530290 is a wasteful number, since it uses less digits than its factorization.

188530290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161163 (or 161160 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 188530290 is about 13730.6332701737. The cubic root of 188530290 is about 573.4035515073.

The spelling of 188530290 in words is "one hundred eighty-eight million, five hundred thirty thousand, two hundred ninety".