1220705 has 4 divisors (see below), whose sum is σ = 1464852. Its totient is φ = 976560.

The previous prime is 1220699. The next prime is 1220711. The reversal of 1220705 is 5070221.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1220699) and next prime (1220711).

It can be written as a sum of positive squares in 2 ways, for example, as 508369 + 712336 = 713^2 + 844^2 .

It is not a de Polignac number, because 1220705 - 2⁴ = 1220689 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122066 + ... + 122075.

It is an arithmetic number, because the mean of its divisors is an integer number (366213).

2^1220705 is an apocalyptic number.

It is an amenable number.

1220705 is a deficient number, since it is larger than the sum of its proper divisors (244147).

1220705 is an equidigital number, since it uses as much as digits as its factorization.

1220705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244146.

The product of its (nonzero) digits is 140, while the sum is 17.

The square root of 1220705 is about 1104.8551941318. The cubic root of 1220705 is about 106.8735513865.

Adding to 1220705 its reverse (5070221), we get a palindrome (6290926).

The spelling of 1220705 in words is "one million, two hundred twenty thousand, seven hundred five".