1220285 has 12 divisors (see below), whose sum is σ = 1610364. Its totient is φ = 887040.

The previous prime is 1220257. The next prime is 1220309. The reversal of 1220285 is 5820221.

It can be written as a sum of positive squares in 2 ways, for example, as 755161 + 465124 = 869^2 + 682^2 .

It is not a de Polignac number, because 1220285 - 2⁸ = 1220029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 404 + ... + 1613.

It is an arithmetic number, because the mean of its divisors is an integer number (134197).

2^1220285 is an apocalyptic number.

It is an amenable number.

1220285 is a deficient number, since it is larger than the sum of its proper divisors (390079).

1220285 is a wasteful number, since it uses less digits than its factorization.

1220285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2044 (or 2033 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 1220285 is about 1104.6651076231. The cubic root of 1220285 is about 106.8612928855.

The spelling of 1220285 in words is "one million, two hundred twenty thousand, two hundred eighty-five".