1320217 has 4 divisors (see below), whose sum is σ = 1323700. Its totient is φ = 1316736.

The previous prime is 1320211. The next prime is 1320247. The reversal of 1320217 is 7120231.

It is a happy number.

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 145161 + 1175056 = 381^2 + 1084^2 .

It is a cyclic number.

It is not a de Polignac number, because 1320217 - 2¹¹ = 1318169 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1320217.

It is not an unprimeable number, because it can be changed into a prime (1320211) 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, 1092 + ... + 1957.

It is an arithmetic number, because the mean of its divisors is an integer number (330925).

2^1320217 is an apocalyptic number.

It is an amenable number.

1320217 is a deficient number, since it is larger than the sum of its proper divisors (3483).

1320217 is an equidigital number, since it uses as much as digits as its factorization.

1320217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3482.

The product of its (nonzero) digits is 84, while the sum is 16.

The square root of 1320217 is about 1149.0069625551. The cubic root of 1320217 is about 109.7021418457.

Subtracting from 1320217 its sum of digits (16), we obtain a square (1320201 = 1149²).

Adding to 1320217 its reverse (7120231), we get a palindrome (8440448).

The spelling of 1320217 in words is "one million, three hundred twenty thousand, two hundred seventeen".