1428643 has 4 divisors (see below), whose sum is σ = 1431040. Its totient is φ = 1426248.

The previous prime is 1428631. The next prime is 1428649. The reversal of 1428643 is 3468241.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1428643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a 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 in 3 ways as a sum of consecutive naturals, for example, 478 + ... + 1756.

It is an arithmetic number, because the mean of its divisors is an integer number (357760).

2^1428643 is an apocalyptic number.

1428643 is a deficient number, since it is larger than the sum of its proper divisors (2397).

1428643 is a wasteful number, since it uses less digits than its factorization.

1428643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2396.

The product of its digits is 4608, while the sum is 28.

The square root of 1428643 is about 1195.2585494361. The cubic root of 1428643 is about 112.6266688469.

The spelling of 1428643 in words is "one million, four hundred twenty-eight thousand, six hundred forty-three".