1330643 has 4 divisors (see below), whose sum is σ = 1333080. Its totient is φ = 1328208.

The previous prime is 1330633. The next prime is 1330649. The reversal of 1330643 is 3460331.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1330643 - 2¹⁰ = 1329619 is a prime.

It is a super-2 number, since 2×1330643² = 3541221586898, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (1330649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23 + ... + 1631.

It is an arithmetic number, because the mean of its divisors is an integer number (333270).

2^1330643 is an apocalyptic number.

1330643 is a deficient number, since it is larger than the sum of its proper divisors (2437).

1330643 is an equidigital number, since it uses as much as digits as its factorization.

1330643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2436.

The product of its (nonzero) digits is 648, while the sum is 20.

The square root of 1330643 is about 1153.5350016363. The cubic root of 1330643 is about 109.9901644098.

Adding to 1330643 its reverse (3460331), we get a palindrome (4790974).

The spelling of 1330643 in words is "one million, three hundred thirty thousand, six hundred forty-three".