189644 has 24 divisors (see below), whose sum is σ = 409248. Its totient is φ = 74880.

The previous prime is 189643. The next prime is 189653. The reversal of 189644 is 446981.

189644 = T₂₇ + T₂₈ + ... + T₁₀₄.

189644 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 189644.

It is not an unprimeable number, because it can be changed into a prime (189643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104 + ... + 624.

It is an arithmetic number, because the mean of its divisors is an integer number (17052).

2¹⁸⁹⁶⁴⁴ is an apocalyptic number.

189644 is a gapful number since it is divisible by the number (14) 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 189644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (204624).

189644 is an abundant number, since it is smaller than the sum of its proper divisors (219604).

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

189644 is a wasteful number, since it uses less digits than its factorization.

189644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 545 (or 543 counting only the distinct ones).

The product of its digits is 6912, while the sum is 32.

The square root of 189644 is about 435.4813428839. The cubic root of 189644 is about 57.4530429487.

The spelling of 189644 in words is "one hundred eighty-nine thousand, six hundred forty-four".