1387228189 has 2 divisors, whose sum is σ = 1387228190. Its totient is φ = 1387228188.

The previous prime is 1387228181. The next prime is 1387228217. The reversal of 1387228189 is 9818227831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 696432100 + 690796089 = 26390^2 + 26283^2 .

It is a cyclic number.

It is not a de Polignac number, because 1387228189 - 2³ = 1387228181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1387228181) 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 as a sum of consecutive naturals, namely, 693614094 + 693614095.

It is an arithmetic number, because the mean of its divisors is an integer number (693614095).

Almost surely, 2^1387228189 is an apocalyptic number.

It is an amenable number.

1387228189 is a deficient number, since it is larger than the sum of its proper divisors (1).

1387228189 is an equidigital number, since it uses as much as digits as its factorization.

1387228189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 387072, while the sum is 49.

The square root of 1387228189 is about 37245.5123337027. The cubic root of 1387228189 is about 1115.2767152226.

The spelling of 1387228189 in words is "one billion, three hundred eighty-seven million, two hundred twenty-eight thousand, one hundred eighty-nine".