1220306 has 8 divisors (see below), whose sum is σ = 1835184. Its totient is φ = 608580.

The previous prime is 1220257. The next prime is 1220309. The reversal of 1220306 is 6030221.

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

It is not an unprimeable number, because it can be changed into a prime (1220309) 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, 941 + ... + 1823.

It is an arithmetic number, because the mean of its divisors is an integer number (229398).

2^1220306 is an apocalyptic number.

1220306 is a deficient number, since it is larger than the sum of its proper divisors (614878).

1220306 is an equidigital number, since it uses as much as digits as its factorization.

1220306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1576.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 1220306 is about 1104.6746127254. The cubic root of 1220306 is about 106.8619058773.

Adding to 1220306 its reverse (6030221), we get a palindrome (7250527).

The spelling of 1220306 in words is "one million, two hundred twenty thousand, three hundred six".