1320647 has 4 divisors (see below), whose sum is σ = 1323576. Its totient is φ = 1317720.

The previous prime is 1320623. The next prime is 1320667. The reversal of 1320647 is 7460231.

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 1320647 - 2⁸ = 1320391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320607) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 629 + ... + 1742.

It is an arithmetic number, because the mean of its divisors is an integer number (330894).

2^1320647 is an apocalyptic number.

1320647 is a deficient number, since it is larger than the sum of its proper divisors (2929).

1320647 is an equidigital number, since it uses as much as digits as its factorization.

1320647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2928.

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 1320647 is about 1149.1940654215. The cubic root of 1320647 is about 109.7140506961.

Adding to 1320647 its reverse (7460231), we get a palindrome (8780878).

The spelling of 1320647 in words is "one million, three hundred twenty thousand, six hundred forty-seven".