1398205889 has 2 divisors, whose sum is σ = 1398205890. Its totient is φ = 1398205888.

The previous prime is 1398205873. The next prime is 1398205909. The reversal of 1398205889 is 9885028931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1268428225 + 129777664 = 35615^2 + 11392^2 .

It is a cyclic number.

It is not a de Polignac number, because 1398205889 - 2⁴ = 1398205873 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1398205889.

It is not a weakly prime, because it can be changed into another prime (1398205849) 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, 699102944 + 699102945.

It is an arithmetic number, because the mean of its divisors is an integer number (699102945).

Almost surely, 2^1398205889 is an apocalyptic number.

It is an amenable number.

1398205889 is a deficient number, since it is larger than the sum of its proper divisors (1).

1398205889 is an equidigital number, since it uses as much as digits as its factorization.

1398205889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1244160, while the sum is 53.

The square root of 1398205889 is about 37392.5913651354. The cubic root of 1398205889 is about 1118.2108682484.

It can be divided in two parts, 139 and 8205889, that added together give a palindrome (8206028).

The spelling of 1398205889 in words is "one billion, three hundred ninety-eight million, two hundred five thousand, eight hundred eighty-nine".