1428689 has 2 divisors, whose sum is σ = 1428690. Its totient is φ = 1428688.

The previous prime is 1428677. The next prime is 1428703. The reversal of 1428689 is 9868241.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 966289 + 462400 = 983^2 + 680^2 .

It is a cyclic number.

It is not a de Polignac number, because 1428689 - 2⁴ = 1428673 is a prime.

It is not a weakly prime, because it can be changed into another prime (1428649) 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, 714344 + 714345.

It is an arithmetic number, because the mean of its divisors is an integer number (714345).

2^1428689 is an apocalyptic number.

It is an amenable number.

1428689 is a deficient number, since it is larger than the sum of its proper divisors (1).

1428689 is an equidigital number, since it uses as much as digits as its factorization.

1428689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27648, while the sum is 38.

The square root of 1428689 is about 1195.2777919798. The cubic root of 1428689 is about 112.6278776330.

Subtracting from 1428689 its product of digits (27648), we obtain a palindrome (1401041).

The spelling of 1428689 in words is "one million, four hundred twenty-eight thousand, six hundred eighty-nine".