1288439 has 2 divisors, whose sum is σ = 1288440. Its totient is φ = 1288438.

The previous prime is 1288429. The next prime is 1288487. The reversal of 1288439 is 9348821.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1288439 - 2⁴ = 1288423 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 1288399 and 1288408.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1288429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 644219 + 644220.

It is an arithmetic number, because the mean of its divisors is an integer number (644220).

2^1288439 is an apocalyptic number.

1288439 is a deficient number, since it is larger than the sum of its proper divisors (1).

1288439 is an equidigital number, since it uses as much as digits as its factorization.

1288439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13824, while the sum is 35.

The square root of 1288439 is about 1135.0942692129. The cubic root of 1288439 is about 108.8147964576.

The spelling of 1288439 in words is "one million, two hundred eighty-eight thousand, four hundred thirty-nine".