1220245 has 8 divisors (see below), whose sum is σ = 1577016. Its totient is φ = 901056.

The previous prime is 1220239. The next prime is 1220249. The reversal of 1220245 is 5420221.

It can be written as a sum of positive squares in 4 ways, for example, as 285156 + 935089 = 534^2 + 967^2 .

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

It is not a de Polignac number, because 1220245 - 2¹¹ = 1218197 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 (1220249) 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 7 ways as a sum of consecutive naturals, for example, 9322 + ... + 9451.

It is an arithmetic number, because the mean of its divisors is an integer number (197127).

2^1220245 is an apocalyptic number.

It is an amenable number.

1220245 is a deficient number, since it is larger than the sum of its proper divisors (356771).

1220245 is a wasteful number, since it uses less digits than its factorization.

1220245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18791.

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 1220245 is about 1104.6470024401. The cubic root of 1220245 is about 106.8601252625.

Adding to 1220245 its reverse (5420221), we get a palindrome (6640466).

The spelling of 1220245 in words is "one million, two hundred twenty thousand, two hundred forty-five".