1428785 has 4 divisors (see below), whose sum is σ = 1714548. Its totient is φ = 1143024.

The previous prime is 1428769. The next prime is 1428787. The reversal of 1428785 is 5878241.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 414736 + 1014049 = 644^2 + 1007^2 .

It is a cyclic number.

It is not a de Polignac number, because 1428785 - 2⁴ = 1428769 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1428787) 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 3 ways as a sum of consecutive naturals, for example, 142874 + ... + 142883.

It is an arithmetic number, because the mean of its divisors is an integer number (428637).

2^1428785 is an apocalyptic number.

It is an amenable number.

1428785 is a deficient number, since it is larger than the sum of its proper divisors (285763).

1428785 is an equidigital number, since it uses as much as digits as its factorization.

1428785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285762.

The product of its digits is 17920, while the sum is 35.

The square root of 1428785 is about 1195.3179493340. The cubic root of 1428785 is about 112.6304002333.

The spelling of 1428785 in words is "one million, four hundred twenty-eight thousand, seven hundred eighty-five".