1405289 has 2 divisors, whose sum is σ = 1405290. Its totient is φ = 1405288.

The previous prime is 1405267. The next prime is 1405309. The reversal of 1405289 is 9825041.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 960400 + 444889 = 980^2 + 667^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1405289 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1405249) 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, 702644 + 702645.

It is an arithmetic number, because the mean of its divisors is an integer number (702645).

2^1405289 is an apocalyptic number.

It is an amenable number.

1405289 is a deficient number, since it is larger than the sum of its proper divisors (1).

1405289 is an equidigital number, since it uses as much as digits as its factorization.

1405289 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 1405289 is about 1185.4488601370. The cubic root of 1405289 is about 112.0095920781.

It can be divided in two parts, 14052 and 89, that added together give a palindrome (14141).

The spelling of 1405289 in words is "one million, four hundred five thousand, two hundred eighty-nine".