1185489389 has 6 divisors (see below), whose sum is σ = 1379038734. Its totient is φ = 1016133720.

The previous prime is 1185489379. The next prime is 1185489397. The reversal of 1185489389 is 9839845811.

It can be written as a sum of positive squares in only one way, i.e., 1023360100 + 162129289 = 31990^2 + 12733^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1185489389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1185489329) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12096782 + ... + 12096879.

It is an arithmetic number, because the mean of its divisors is an integer number (229839789).

Almost surely, 2^1185489389 is an apocalyptic number.

It is an amenable number.

1185489389 is a deficient number, since it is larger than the sum of its proper divisors (193549345).

1185489389 is an equidigital number, since it uses as much as digits as its factorization.

1185489389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24193675 (or 24193668 counting only the distinct ones).

The product of its digits is 2488320, while the sum is 56.

The square root of 1185489389 is about 34430.9365106440. The cubic root of 1185489389 is about 1058.3579027563.

The spelling of 1185489389 in words is "one billion, one hundred eighty-five million, four hundred eighty-nine thousand, three hundred eighty-nine".