1289243 has 4 divisors (see below), whose sum is σ = 1301400. Its totient is φ = 1277088.

The previous prime is 1289237. The next prime is 1289261. The reversal of 1289243 is 3429821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1289243 - 2⁶ = 1289179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1289213) 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 in 3 ways as a sum of consecutive naturals, for example, 5918 + ... + 6131.

It is an arithmetic number, because the mean of its divisors is an integer number (325350).

2^1289243 is an apocalyptic number.

1289243 is a deficient number, since it is larger than the sum of its proper divisors (12157).

1289243 is a wasteful number, since it uses less digits than its factorization.

1289243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12156.

The product of its digits is 3456, while the sum is 29.

The square root of 1289243 is about 1135.4483695880. The cubic root of 1289243 is about 108.8374256249.

It can be divided in two parts, 12 and 89243, that multiplied together give a triangular number (1070916 = T₁₄₆₃).

The spelling of 1289243 in words is "one million, two hundred eighty-nine thousand, two hundred forty-three".