1329985 has 8 divisors (see below), whose sum is σ = 1602216. Its totient is φ = 1059840.

The previous prime is 1329971. The next prime is 1330001. The reversal of 1329985 is 5899231.

It can be written as a sum of positive squares in 4 ways, for example, as 400689 + 929296 = 633^2 + 964^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1329985 - 2⁵ = 1329953 is a prime.

It is a Duffinian number.

1329985 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2017 + ... + 2593.

It is an arithmetic number, because the mean of its divisors is an integer number (200277).

2^1329985 is an apocalyptic number.

1329985 is the 577-th decagonal number.

It is an amenable number.

1329985 is a deficient number, since it is larger than the sum of its proper divisors (272231).

1329985 is an equidigital number, since it uses as much as digits as its factorization.

1329985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1043.

The product of its digits is 19440, while the sum is 37.

The square root of 1329985 is about 1153.2497561240. The cubic root of 1329985 is about 109.9720314568.

The spelling of 1329985 in words is "one million, three hundred twenty-nine thousand, nine hundred eighty-five".