189038839 has 4 divisors (see below), whose sum is σ = 206224200. Its totient is φ = 171853480.

The previous prime is 189038831. The next prime is 189038867. The reversal of 189038839 is 938830981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 938830981 = 11 ⋅85348271.

It is a cyclic number.

It is not a de Polignac number, because 189038839 - 2³ = 189038831 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 189038792 and 189038801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189038831) 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 in 3 ways as a sum of consecutive naturals, for example, 8592664 + ... + 8592685.

It is an arithmetic number, because the mean of its divisors is an integer number (51556050).

Almost surely, 2^189038839 is an apocalyptic number.

189038839 is a deficient number, since it is larger than the sum of its proper divisors (17185361).

189038839 is a wasteful number, since it uses less digits than its factorization.

189038839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17185360.

The product of its (nonzero) digits is 373248, while the sum is 49.

The square root of 189038839 is about 13749.1395730787. The cubic root of 189038839 is about 573.9186623690.

The spelling of 189038839 in words is "one hundred eighty-nine million, thirty-eight thousand, eight hundred thirty-nine".