139189 has 4 divisors (see below), whose sum is σ = 140140. Its totient is φ = 138240.

The previous prime is 139187. The next prime is 139199. The reversal of 139189 is 981931.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 20164 + 119025 = 142^2 + 345^2 .

It is a cyclic number.

It is not a de Polignac number, because 139189 - 2¹ = 139187 is a prime.

It is a Duffinian number.

139189 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 139189.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 204 + ... + 565.

It is an arithmetic number, because the mean of its divisors is an integer number (35035).

2¹³⁹¹⁸⁹ is an apocalyptic number.

It is an amenable number.

139189 is a deficient number, since it is larger than the sum of its proper divisors (951).

139189 is an equidigital number, since it uses as much as digits as its factorization.

139189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 950.

The product of its digits is 1944, while the sum is 31.

The square root of 139189 is about 373.0804202850. The cubic root of 139189 is about 51.8244821984.

The spelling of 139189 in words is "one hundred thirty-nine thousand, one hundred eighty-nine".