1428729 has 4 divisors (see below), whose sum is σ = 1904976. Its totient is φ = 952484.

The previous prime is 1428709. The next prime is 1428751. The reversal of 1428729 is 9278241.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1428729 - 2⁷ = 1428601 is a prime.

It is a d-powerful number, because it can be written as 1 + 4⁸ + 2³ + 8 + 7⁷ + 2¹³ + 9⁶ .

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 1428729.

It is not an unprimeable number, because it can be changed into a prime (1428709) 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 3 ways as a sum of consecutive naturals, for example, 238119 + ... + 238124.

It is an arithmetic number, because the mean of its divisors is an integer number (476244).

2^1428729 is an apocalyptic number.

It is an amenable number.

1428729 is a deficient number, since it is larger than the sum of its proper divisors (476247).

1428729 is an equidigital number, since it uses as much as digits as its factorization.

1428729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 476246.

The product of its digits is 8064, while the sum is 33.

The square root of 1428729 is about 1195.2945243746. The cubic root of 1428729 is about 112.6289287302.

The spelling of 1428729 in words is "one million, four hundred twenty-eight thousand, seven hundred twenty-nine".