1329789 has 4 divisors (see below), whose sum is σ = 1773056. Its totient is φ = 886524.

The previous prime is 1329787. The next prime is 1329799. The reversal of 1329789 is 9879231.

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 not a de Polignac number, because 1329789 - 2¹ = 1329787 is a prime.

It is a D-number.

It is a Duffinian number.

1329789 is a lucky number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1329787) 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, 221629 + ... + 221634.

It is an arithmetic number, because the mean of its divisors is an integer number (443264).

2^1329789 is an apocalyptic number.

It is an amenable number.

1329789 is a deficient number, since it is larger than the sum of its proper divisors (443267).

1329789 is an equidigital number, since it uses as much as digits as its factorization.

1329789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443266.

The product of its digits is 27216, while the sum is 39.

The square root of 1329789 is about 1153.1647757368. The cubic root of 1329789 is about 109.9666289956.

The spelling of 1329789 in words is "one million, three hundred twenty-nine thousand, seven hundred eighty-nine".