1289072389 has 4 divisors (see below), whose sum is σ = 1406260800. Its totient is φ = 1171883980.

The previous prime is 1289072383. The next prime is 1289072401. The reversal of 1289072389 is 9832709821.

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.

It is a cyclic number.

It is not a de Polignac number, because 1289072389 - 2¹³ = 1289064197 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1289072383) 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, 58594189 + ... + 58594210.

It is an arithmetic number, because the mean of its divisors is an integer number (351565200).

Almost surely, 2^1289072389 is an apocalyptic number.

It is an amenable number.

1289072389 is a deficient number, since it is larger than the sum of its proper divisors (117188411).

1289072389 is a wasteful number, since it uses less digits than its factorization.

1289072389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117188410.

The product of its (nonzero) digits is 435456, while the sum is 49.

The square root of 1289072389 is about 35903.6542569137. The cubic root of 1289072389 is about 1088.3262444020.

The spelling of 1289072389 in words is "one billion, two hundred eighty-nine million, seventy-two thousand, three hundred eighty-nine".