1330405 has 4 divisors (see below), whose sum is σ = 1596492. Its totient is φ = 1064320.

The previous prime is 1330397. The next prime is 1330411. The reversal of 1330405 is 5040331.

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 277729 + 1052676 = 527^2 + 1026^2 .

It is not a de Polignac number, because 1330405 - 2³ = 1330397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133036 + ... + 133045.

It is an arithmetic number, because the mean of its divisors is an integer number (399123).

2^1330405 is an apocalyptic number.

It is an amenable number.

1330405 is a deficient number, since it is larger than the sum of its proper divisors (266087).

1330405 is an equidigital number, since it uses as much as digits as its factorization.

1330405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266086.

The product of its (nonzero) digits is 180, while the sum is 16.

The square root of 1330405 is about 1153.4318358707. The cubic root of 1330405 is about 109.9836063724.

Adding to 1330405 its reverse (5040331), we get a palindrome (6370736).

The spelling of 1330405 in words is "one million, three hundred thirty thousand, four hundred five".