1220085 has 24 divisors (see below), whose sum is σ = 2227680. Its totient is φ = 616032.

The previous prime is 1220077. The next prime is 1220099. The reversal of 1220085 is 5800221.

It is not a de Polignac number, because 1220085 - 2³ = 1220077 is a prime.

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 23 ways as a sum of consecutive naturals, for example, 142 + ... + 1568.

It is an arithmetic number, because the mean of its divisors is an integer number (92820).

2^1220085 is an apocalyptic number.

1220085 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1220085 is a deficient number, since it is larger than the sum of its proper divisors (1007595).

1220085 is a wasteful number, since it uses less digits than its factorization.

1220085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1457 (or 1454 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 1220085 is about 1104.5745787406. The cubic root of 1220085 is about 106.8554545154.

The spelling of 1220085 in words is "one million, two hundred twenty thousand, eighty-five".