1398237989 has 2 divisors, whose sum is σ = 1398237990. Its totient is φ = 1398237988.

The previous prime is 1398237983. The next prime is 1398238001. The reversal of 1398237989 is 9897328931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 828461089 + 569776900 = 28783^2 + 23870^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1398237989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1398237983) 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, 699118994 + 699118995.

It is an arithmetic number, because the mean of its divisors is an integer number (699118995).

Almost surely, 2^1398237989 is an apocalyptic number.

It is an amenable number.

1398237989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1398237989 is an equidigital number, since it uses as much as digits as its factorization.

1398237989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5878656, while the sum is 59.

The square root of 1398237989 is about 37393.0205920838. The cubic root of 1398237989 is about 1118.2194254751.

The spelling of 1398237989 in words is "one billion, three hundred ninety-eight million, two hundred thirty-seven thousand, nine hundred eighty-nine".