1889209189 has 4 divisors (see below), whose sum is σ = 2159096224. Its totient is φ = 1619322156.

The previous prime is 1889209177. The next prime is 1889209207. The reversal of 1889209189 is 9819029881.

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: 9819029881 = 17 ⋅577589993.

It is a cyclic number.

It is not a de Polignac number, because 1889209189 - 2²¹ = 1887112037 is a prime.

It is a super-2 number, since 2×1889209189² = 7138222719604075442, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1889209789) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134943507 + ... + 134943520.

It is an arithmetic number, because the mean of its divisors is an integer number (539774056).

Almost surely, 2^1889209189 is an apocalyptic number.

It is an amenable number.

1889209189 is a deficient number, since it is larger than the sum of its proper divisors (269887035).

1889209189 is an equidigital number, since it uses as much as digits as its factorization.

1889209189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269887034.

The product of its (nonzero) digits is 746496, while the sum is 55.

The square root of 1889209189 is about 43465.0340963860. The cubic root of 1889209189 is about 1236.2131236770.

The spelling of 1889209189 in words is "one billion, eight hundred eighty-nine million, two hundred nine thousand, one hundred eighty-nine".