1428217 has 8 divisors (see below), whose sum is σ = 1639616. Its totient is φ = 1218672.

The previous prime is 1428209. The next prime is 1428233. The reversal of 1428217 is 7128241.

It is a happy number.

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

It is not a de Polignac number, because 1428217 - 2³ = 1428209 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1428191 and 1428200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1428247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2338 + ... + 2884.

It is an arithmetic number, because the mean of its divisors is an integer number (204952).

2^1428217 is an apocalyptic number.

It is an amenable number.

1428217 is a deficient number, since it is larger than the sum of its proper divisors (211399).

1428217 is an equidigital number, since it uses as much as digits as its factorization.

1428217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 927.

The product of its digits is 896, while the sum is 25.

The square root of 1428217 is about 1195.0803320279. The cubic root of 1428217 is about 112.6154732040.

The spelling of 1428217 in words is "one million, four hundred twenty-eight thousand, two hundred seventeen".