1329390985 has 8 divisors (see below), whose sum is σ = 1717982280. Its totient is φ = 981704064.

The previous prime is 1329390983. The next prime is 1329390991. The reversal of 1329390985 is 5890939231.

It can be written as a sum of positive squares in 4 ways, for example, as 21049744 + 1308341241 = 4588^2 + 36171^2 .

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 1329390985 - 2¹ = 1329390983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1329390983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10226020 + ... + 10226149.

It is an arithmetic number, because the mean of its divisors is an integer number (214747785).

Almost surely, 2^1329390985 is an apocalyptic number.

It is an amenable number.

1329390985 is a deficient number, since it is larger than the sum of its proper divisors (388591295).

1329390985 is a wasteful number, since it uses less digits than its factorization.

1329390985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20452187.

The product of its (nonzero) digits is 524880, while the sum is 49.

The square root of 1329390985 is about 36460.8143765331. The cubic root of 1329390985 is about 1099.5565664455.

The spelling of 1329390985 in words is "one billion, three hundred twenty-nine million, three hundred ninety thousand, nine hundred eighty-five".