1329265 has 16 divisors (see below), whose sum is σ = 1842048. Its totient is φ = 902016.

The previous prime is 1329241. The next prime is 1329269. The reversal of 1329265 is 5629231.

1329265 is a nontrivial binomial coefficient, being equal to C(1631, 2).

It is a cyclic number.

It is not a de Polignac number, because 1329265 - 2⁵ = 1329233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1329269) 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, 5589 + ... + 5821.

It is an arithmetic number, because the mean of its divisors is an integer number (115128).

2^1329265 is an apocalyptic number.

1329265 is the 1630-th triangular number.

1329265 is the 544-th centered nonagonal number.

It is an amenable number.

1329265 is a deficient number, since it is larger than the sum of its proper divisors (512783).

1329265 is a wasteful number, since it uses less digits than its factorization.

1329265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408.

The product of its digits is 3240, while the sum is 28.

The square root of 1329265 is about 1152.9375525153. The cubic root of 1329265 is about 109.9521830738.

It can be divided in two parts, 1 and 329265, that added together give a triangular number (329266 = T₈₁₁).

The spelling of 1329265 in words is "one million, three hundred twenty-nine thousand, two hundred sixty-five".