1329989 has 4 divisors (see below), whose sum is σ = 1333056. Its totient is φ = 1326924.

The previous prime is 1329971. The next prime is 1330001. The reversal of 1329989 is 9899231.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9899231 = 1993 ⋅4967.

It is a cyclic number.

It is not a de Polignac number, because 1329989 - 2⁸ = 1329733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1329949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 749 + ... + 1794.

It is an arithmetic number, because the mean of its divisors is an integer number (333264).

2^1329989 is an apocalyptic number.

It is an amenable number.

1329989 is a deficient number, since it is larger than the sum of its proper divisors (3067).

1329989 is an equidigital number, since it uses as much as digits as its factorization.

1329989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3066.

The product of its digits is 34992, while the sum is 41.

The square root of 1329989 is about 1153.2514903524. The cubic root of 1329989 is about 109.9721417056.

The spelling of 1329989 in words is "one million, three hundred twenty-nine thousand, nine hundred eighty-nine".