1216085 has 16 divisors (see below), whose sum is σ = 1605744. Its totient is φ = 878592.

The previous prime is 1216069. The next prime is 1216087. The reversal of 1216085 is 5806121.

It can be written as a sum of positive squares in 8 ways, for example, as 47524 + 1168561 = 218^2 + 1081^2 .

It is not a de Polignac number, because 1216085 - 2⁴ = 1216069 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1216085.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216087) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3269 + ... + 3621.

It is an arithmetic number, because the mean of its divisors is an integer number (100359).

2^1216085 is an apocalyptic number.

It is an amenable number.

1216085 is a deficient number, since it is larger than the sum of its proper divisors (389659).

1216085 is a wasteful number, since it uses less digits than its factorization.

1216085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 1216085 is about 1102.7624404195. The cubic root of 1216085 is about 106.7385528881.

The spelling of 1216085 in words is "one million, two hundred sixteen thousand, eighty-five".