189447389 has 4 divisors (see below), whose sum is σ = 197684256. Its totient is φ = 181210524.

The previous prime is 189447367. The next prime is 189447421. The reversal of 189447389 is 983744981.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 983744981 = 10903 ⋅90227.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-189447389 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 189447389.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189447359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4118399 + ... + 4118444.

It is an arithmetic number, because the mean of its divisors is an integer number (49421064).

Almost surely, 2^189447389 is an apocalyptic number.

It is an amenable number.

189447389 is a deficient number, since it is larger than the sum of its proper divisors (8236867).

189447389 is an equidigital number, since it uses as much as digits as its factorization.

189447389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8236866.

The product of its digits is 1741824, while the sum is 53.

The square root of 189447389 is about 13763.9888477142. The cubic root of 189447389 is about 574.3318151338.

The spelling of 189447389 in words is "one hundred eighty-nine million, four hundred forty-seven thousand, three hundred eighty-nine".