188729 has 2 divisors, whose sum is σ = 188730. Its totient is φ = 188728.

The previous prime is 188719. The next prime is 188753. The reversal of 188729 is 927881.

It is a happy number.

188729 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 182329 + 6400 = 427^2 + 80^2 .

It is a cyclic number.

It is not a de Polignac number, because 188729 - 2⁸ = 188473 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (188719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94364 + 94365.

It is an arithmetic number, because the mean of its divisors is an integer number (94365).

2¹⁸⁸⁷²⁹ is an apocalyptic number.

It is an amenable number.

188729 is a deficient number, since it is larger than the sum of its proper divisors (1).

188729 is an equidigital number, since it uses as much as digits as its factorization.

188729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 35.

The square root of 188729 is about 434.4295109681. The cubic root of 188729 is about 57.3604935614.

It can be divided in two parts, 18872 and 9, that added together give a palindrome (18881).

The spelling of 188729 in words is "one hundred eighty-eight thousand, seven hundred twenty-nine".