1389342239 has 2 divisors, whose sum is σ = 1389342240. Its totient is φ = 1389342238.

The previous prime is 1389342233. The next prime is 1389342259. The reversal of 1389342239 is 9322439831.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1389342239 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1389342239.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1389342233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 694671119 + 694671120.

It is an arithmetic number, because the mean of its divisors is an integer number (694671120).

Almost surely, 2^1389342239 is an apocalyptic number.

1389342239 is a deficient number, since it is larger than the sum of its proper divisors (1).

1389342239 is an equidigital number, since it uses as much as digits as its factorization.

1389342239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 279936, while the sum is 44.

The square root of 1389342239 is about 37273.8814587373. The cubic root of 1389342239 is about 1115.8429652653.

The spelling of 1389342239 in words is "one billion, three hundred eighty-nine million, three hundred forty-two thousand, two hundred thirty-nine".