1329505 has 16 divisors (see below), whose sum is σ = 1691280. Its totient is φ = 1001728.

The previous prime is 1329499. The next prime is 1329509. The reversal of 1329505 is 5059231.

It can be written as a sum of positive squares in 8 ways, for example, as 112896 + 1216609 = 336^2 + 1103^2 .

It is a cyclic number.

It is not a de Polignac number, because 1329505 - 2¹⁷ = 1198433 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1329505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1329509) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7599 + ... + 7771.

It is an arithmetic number, because the mean of its divisors is an integer number (105705).

2^1329505 is an apocalyptic number.

It is an amenable number.

1329505 is a deficient number, since it is larger than the sum of its proper divisors (361775).

1329505 is a wasteful number, since it uses less digits than its factorization.

1329505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260.

The product of its (nonzero) digits is 1350, while the sum is 25.

The square root of 1329505 is about 1153.0416297775. The cubic root of 1329505 is about 109.9587999976.

The spelling of 1329505 in words is "one million, three hundred twenty-nine thousand, five hundred five".