1320557 has 8 divisors (see below), whose sum is σ = 1588800. Its totient is φ = 1072224.

The previous prime is 1320541. The next prime is 1320607. The reversal of 1320557 is 7550231.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1320557 - 2⁴ = 1320541 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 (1320157) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4832 + ... + 5097.

It is an arithmetic number, because the mean of its divisors is an integer number (198600).

2^1320557 is an apocalyptic number.

It is an amenable number.

1320557 is a deficient number, since it is larger than the sum of its proper divisors (268243).

1320557 is an equidigital number, since it uses as much as digits as its factorization.

1320557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9955.

The product of its (nonzero) digits is 1050, while the sum is 23.

The square root of 1320557 is about 1149.1549068772. The cubic root of 1320557 is about 109.7115583600.

Adding to 1320557 its reverse (7550231), we get a palindrome (8870788).

The spelling of 1320557 in words is "one million, three hundred twenty thousand, five hundred fifty-seven".