188490 has 32 divisors (see below), whose sum is σ = 464256. Its totient is φ = 48960.

The previous prime is 188483. The next prime is 188491. The reversal of 188490 is 94881.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (188491) by changing a digit.

188490 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1779 + ... + 1881.

It is an arithmetic number, because the mean of its divisors is an integer number (14508).

2¹⁸⁸⁴⁹⁰ is an apocalyptic number.

188490 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 188490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (232128).

188490 is an abundant number, since it is smaller than the sum of its proper divisors (275766).

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

188490 is a wasteful number, since it uses less digits than its factorization.

188490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174.

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 188490 is about 434.1543504331. The cubic root of 188490 is about 57.3362702059.

The spelling of 188490 in words is "one hundred eighty-eight thousand, four hundred ninety".