1389290369 has 2 divisors, whose sum is σ = 1389290370. Its totient is φ = 1389290368.

The previous prime is 1389290341. The next prime is 1389290381. The reversal of 1389290369 is 9630929831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 863184400 + 526105969 = 29380^2 + 22937^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1389290369 is a prime.

It is a super-2 number, since 2×1389290369² = 3860255458792312322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1389290339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 694645184 + 694645185.

It is an arithmetic number, because the mean of its divisors is an integer number (694645185).

Almost surely, 2^1389290369 is an apocalyptic number.

It is an amenable number.

1389290369 is a deficient number, since it is larger than the sum of its proper divisors (1).

1389290369 is an equidigital number, since it uses as much as digits as its factorization.

1389290369 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 629856, while the sum is 50.

The square root of 1389290369 is about 37273.1856567157. The cubic root of 1389290369 is about 1115.8290787193.

The spelling of 1389290369 in words is "one billion, three hundred eighty-nine million, two hundred ninety thousand, three hundred sixty-nine".