1220347 has 2 divisors, whose sum is σ = 1220348. Its totient is φ = 1220346.

The previous prime is 1220333. The next prime is 1220353. The reversal of 1220347 is 7430221.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1220347 is a prime.

It is not a weakly prime, because it can be changed into another prime (1220327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610173 + 610174.

It is an arithmetic number, because the mean of its divisors is an integer number (610174).

2^1220347 is an apocalyptic number.

1220347 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220347 is an equidigital number, since it uses as much as digits as its factorization.

1220347 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 336, while the sum is 19.

The square root of 1220347 is about 1104.6931700703. The cubic root of 1220347 is about 106.8631026506.

Adding to 1220347 its reverse (7430221), we get a palindrome (8650568).

The spelling of 1220347 in words is "one million, two hundred twenty thousand, three hundred forty-seven".