1389556843 has 2 divisors, whose sum is σ = 1389556844. Its totient is φ = 1389556842.

The previous prime is 1389556823. The next prime is 1389556853. The reversal of 1389556843 is 3486559831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1389556843 - 2¹³ = 1389548651 is a prime.

It is not a weakly prime, because it can be changed into another prime (1389556823) 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, 694778421 + 694778422.

It is an arithmetic number, because the mean of its divisors is an integer number (694778422).

Almost surely, 2^1389556843 is an apocalyptic number.

1389556843 is a deficient number, since it is larger than the sum of its proper divisors (1).

1389556843 is an equidigital number, since it uses as much as digits as its factorization.

1389556843 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3110400, while the sum is 52.

The square root of 1389556843 is about 37276.7600925832. The cubic root of 1389556843 is about 1115.9004150015.

The spelling of 1389556843 in words is "one billion, three hundred eighty-nine million, five hundred fifty-six thousand, eight hundred forty-three".