1428805 has 8 divisors (see below), whose sum is σ = 1959552. Its totient is φ = 979728.

The previous prime is 1428793. The next prime is 1428811. The reversal of 1428805 is 5088241.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1428805 - 2⁷ = 1428677 is a prime.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 20377 + ... + 20446.

It is an arithmetic number, because the mean of its divisors is an integer number (244944).

2^1428805 is an apocalyptic number.

It is an amenable number.

1428805 is a deficient number, since it is larger than the sum of its proper divisors (530747).

1428805 is an equidigital number, since it uses as much as digits as its factorization.

1428805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40835.

The product of its (nonzero) digits is 2560, while the sum is 28.

The square root of 1428805 is about 1195.3263152796. The cubic root of 1428805 is about 112.6309257608.

The spelling of 1428805 in words is "one million, four hundred twenty-eight thousand, eight hundred five".