1329471989 has 4 divisors (see below), whose sum is σ = 1342635180. Its totient is φ = 1316308800.

The previous prime is 1329471959. The next prime is 1329472021. The reversal of 1329471989 is 9891749231.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1284648964 + 44823025 = 35842^2 + 6695^2 .

It is a cyclic number.

It is not a de Polignac number, because 1329471989 - 2⁸ = 1329471733 is a prime.

It is a super-2 number, since 2×1329471989² = 3534991539071232242, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1329471989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1329471929) 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, 6581444 + ... + 6581645.

It is an arithmetic number, because the mean of its divisors is an integer number (335658795).

Almost surely, 2^1329471989 is an apocalyptic number.

It is an amenable number.

1329471989 is a deficient number, since it is larger than the sum of its proper divisors (13163191).

1329471989 is a wasteful number, since it uses less digits than its factorization.

1329471989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13163190.

The product of its digits is 979776, while the sum is 53.

The square root of 1329471989 is about 36461.9251960178. The cubic root of 1329471989 is about 1099.5788991458.

The spelling of 1329471989 in words is "one billion, three hundred twenty-nine million, four hundred seventy-one thousand, nine hundred eighty-nine".