188990 has 8 divisors (see below), whose sum is σ = 340200. Its totient is φ = 75592.

The previous prime is 188983. The next prime is 188999. The reversal of 188990 is 99881.

It is a happy number.

188990 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 188990.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (188999) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9440 + ... + 9459.

It is an arithmetic number, because the mean of its divisors is an integer number (42525).

2¹⁸⁸⁹⁹⁰ is an apocalyptic number.

188990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

188990 is a deficient number, since it is larger than the sum of its proper divisors (151210).

188990 is a wasteful number, since it uses less digits than its factorization.

188990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18906.

The product of its (nonzero) digits is 5184, while the sum is 35.

The square root of 188990 is about 434.7298011409. The cubic root of 188990 is about 57.3869233324.

The spelling of 188990 in words is "one hundred eighty-eight thousand, nine hundred ninety".