1428789 has 8 divisors (see below), whose sum is σ = 1910592. Its totient is φ = 949760.

The previous prime is 1428787. The next prime is 1428793. The reversal of 1428789 is 9878241.

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 1428789 - 2¹ = 1428787 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1428787) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1552 + ... + 2294.

It is an arithmetic number, because the mean of its divisors is an integer number (238824).

2^1428789 is an apocalyptic number.

It is an amenable number.

1428789 is a deficient number, since it is larger than the sum of its proper divisors (481803).

1428789 is an equidigital number, since it uses as much as digits as its factorization.

1428789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1387.

The product of its digits is 32256, while the sum is 39.

The square root of 1428789 is about 1195.3196225278. The cubic root of 1428789 is about 112.6305053392.

The spelling of 1428789 in words is "one million, four hundred twenty-eight thousand, seven hundred eighty-nine".