188389 has 2 divisors, whose sum is σ = 188390. Its totient is φ = 188388.

The previous prime is 188369. The next prime is 188401. The reversal of 188389 is 983881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 187489 + 900 = 433^2 + 30^2 .

It is an emirp because it is prime and its reverse (983881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 188389 - 2⁷ = 188261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (188359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94194 + 94195.

It is an arithmetic number, because the mean of its divisors is an integer number (94195).

2¹⁸⁸³⁸⁹ is an apocalyptic number.

It is an amenable number.

188389 is a deficient number, since it is larger than the sum of its proper divisors (1).

188389 is an equidigital number, since it uses as much as digits as its factorization.

188389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13824, while the sum is 37.

The square root of 188389 is about 434.0380167681. The cubic root of 188389 is about 57.3260274027.

The spelling of 188389 in words is "one hundred eighty-eight thousand, three hundred eighty-nine".