1289239 has 12 divisors (see below), whose sum is σ = 1522584. Its totient is φ = 1088304.

The previous prime is 1289237. The next prime is 1289261. The reversal of 1289239 is 9329821.

It is not a de Polignac number, because 1289239 - 2¹ = 1289237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1289231) 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 11 ways as a sum of consecutive naturals, for example, 3909 + ... + 4225.

It is an arithmetic number, because the mean of its divisors is an integer number (126882).

2^1289239 is an apocalyptic number.

1289239 is a deficient number, since it is larger than the sum of its proper divisors (233345).

1289239 is an equidigital number, since it uses as much as digits as its factorization.

1289239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414 (or 407 counting only the distinct ones).

The product of its digits is 7776, while the sum is 34.

The square root of 1289239 is about 1135.4466081679. The cubic root of 1289239 is about 108.8373130652.

The spelling of 1289239 in words is "one million, two hundred eighty-nine thousand, two hundred thirty-nine".