1428649 has 2 divisors, whose sum is σ = 1428650. Its totient is φ = 1428648.

The previous prime is 1428631. The next prime is 1428671. The reversal of 1428649 is 9468241.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1338649 + 90000 = 1157^2 + 300^2 .

It is an emirp because it is prime and its reverse (9468241) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1428649 - 2⁷ = 1428521 is a prime.

It is not a weakly prime, because it can be changed into another prime (1428689) 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, 714324 + 714325.

It is an arithmetic number, because the mean of its divisors is an integer number (714325).

2^1428649 is an apocalyptic number.

It is an amenable number.

1428649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1428649 is an equidigital number, since it uses as much as digits as its factorization.

1428649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13824, while the sum is 34.

The square root of 1428649 is about 1195.2610593506. The cubic root of 1428649 is about 112.6268265161.

The spelling of 1428649 in words is "one million, four hundred twenty-eight thousand, six hundred forty-nine".