1389257539 has 2 divisors, whose sum is σ = 1389257540. Its totient is φ = 1389257538.

The previous prime is 1389257509. The next prime is 1389257567. The reversal of 1389257539 is 9357529831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1389257539 - 2¹⁷ = 1389126467 is a prime.

It is not a weakly prime, because it can be changed into another prime (1389257509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 694628769 + 694628770.

It is an arithmetic number, because the mean of its divisors is an integer number (694628770).

Almost surely, 2^1389257539 is an apocalyptic number.

1389257539 is a deficient number, since it is larger than the sum of its proper divisors (1).

1389257539 is an equidigital number, since it uses as much as digits as its factorization.

1389257539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2041200, while the sum is 52.

The square root of 1389257539 is about 37272.7452570910. The cubic root of 1389257539 is about 1115.8202893503.

The spelling of 1389257539 in words is "one billion, three hundred eighty-nine million, two hundred fifty-seven thousand, five hundred thirty-nine".