2389987189 has 2 divisors, whose sum is σ = 2389987190. Its totient is φ = 2389987188.

The previous prime is 2389987151. The next prime is 2389987231. The reversal of 2389987189 is 9817899832.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2317652164 + 72335025 = 48142^2 + 8505^2 .

It is a cyclic number.

It is not a de Polignac number, because 2389987189 - 2²⁹ = 1853116277 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2389987189.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2389987289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1194993594 + 1194993595.

It is an arithmetic number, because the mean of its divisors is an integer number (1194993595).

Almost surely, 2^2389987189 is an apocalyptic number.

It is an amenable number.

2389987189 is a deficient number, since it is larger than the sum of its proper divisors (1).

2389987189 is an equidigital number, since it uses as much as digits as its factorization.

2389987189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15676416, while the sum is 64.

The square root of 2389987189 is about 48887.4952211708. The cubic root of 2389987189 is about 1337.0013866117.

The spelling of 2389987189 in words is "two billion, three hundred eighty-nine million, nine hundred eighty-seven thousand, one hundred eighty-nine".