1216265 has 16 divisors (see below), whose sum is σ = 1587600. Its totient is φ = 890880.

The previous prime is 1216249. The next prime is 1216273. The reversal of 1216265 is 5626121.

It can be written as a sum of positive squares in 8 ways, for example, as 8464 + 1207801 = 92^2 + 1099^2 .

It is not a de Polignac number, because 1216265 - 2⁴ = 1216249 is a prime.

It is a plaindrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 1216265.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3311 + ... + 3659.

It is an arithmetic number, because the mean of its divisors is an integer number (99225).

2^1216265 is an apocalyptic number.

It is an amenable number.

1216265 is a deficient number, since it is larger than the sum of its proper divisors (371335).

1216265 is a wasteful number, since it uses less digits than its factorization.

1216265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412.

The product of its digits is 720, while the sum is 23.

The square root of 1216265 is about 1102.8440506255. The cubic root of 1216265 is about 106.7438189651.

The spelling of 1216265 in words is "one million, two hundred sixteen thousand, two hundred sixty-five".