139742189 has 2 divisors, whose sum is σ = 139742190. Its totient is φ = 139742188.

The previous prime is 139742179. The next prime is 139742191. The reversal of 139742189 is 981247931.

139742189 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 105226564 + 34515625 = 10258^2 + 5875^2 .

It is a cyclic number.

It is not a de Polignac number, because 139742189 - 2²⁰ = 138693613 is a prime.

Together with 139742191, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139742179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69871094 + 69871095.

It is an arithmetic number, because the mean of its divisors is an integer number (69871095).

Almost surely, 2^139742189 is an apocalyptic number.

It is an amenable number.

139742189 is a deficient number, since it is larger than the sum of its proper divisors (1).

139742189 is an equidigital number, since it uses as much as digits as its factorization.

139742189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 44.

The square root of 139742189 is about 11821.2600428212. The cubic root of 139742189 is about 518.9304805019.

It can be divided in two parts, 139742 and 189, that added together give a palindrome (139931).

The spelling of 139742189 in words is "one hundred thirty-nine million, seven hundred forty-two thousand, one hundred eighty-nine".