1299989 has 2 divisors, whose sum is σ = 1299990. Its totient is φ = 1299988.

The previous prime is 1299979. The next prime is 1300021. The reversal of 1299989 is 9899921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1119364 + 180625 = 1058^2 + 425^2 .

It is an emirp because it is prime and its reverse (9899921) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1299989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1299919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 649994 + 649995.

It is an arithmetic number, because the mean of its divisors is an integer number (649995).

2^1299989 is an apocalyptic number.

It is an amenable number.

1299989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1299989 is an equidigital number, since it uses as much as digits as its factorization.

1299989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 104976, while the sum is 47.

The square root of 1299989 is about 1140.1706012698. The cubic root of 1299989 is about 109.1389804765.

It can be divided in two parts, 12 and 99989, that added together give a palindrome (100001).

The spelling of 1299989 in words is "one million, two hundred ninety-nine thousand, nine hundred eighty-nine".