1200989 has 2 divisors, whose sum is σ = 1200990. Its totient is φ = 1200988.

The previous prime is 1200959. The next prime is 1201001. The reversal of 1200989 is 9890021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1138489 + 62500 = 1067^2 + 250^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1200989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1200929) 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, 600494 + 600495.

It is an arithmetic number, because the mean of its divisors is an integer number (600495).

2^1200989 is an apocalyptic number.

It is an amenable number.

1200989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200989 is an equidigital number, since it uses as much as digits as its factorization.

1200989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 1200989 is about 1095.8964367129. The cubic root of 1200989 is about 106.2950424942.

The spelling of 1200989 in words is "one million, two hundred thousand, nine hundred eighty-nine".