1216836369 has 24 divisors (see below), whose sum is σ = 2022064512. Its totient is φ = 690724800.

The previous prime is 1216836349. The next prime is 1216836373. The reversal of 1216836369 is 9636386121.

1216836369 is a `hidden beast` number, since 1 + 2 + 1 + 6 + 8 + 3 + 636 + 9 = 666.

It is not a de Polignac number, because 1216836369 - 2¹¹ = 1216834321 is a prime.

It is a super-2 number, since 2×1216836369² = 2961381497842208322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1216836349) by changing a digit.

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, 54444 + ... + 73469.

It is an arithmetic number, because the mean of its divisors is an integer number (84252688).

Almost surely, 2^1216836369 is an apocalyptic number.

It is an amenable number.

1216836369 is a deficient number, since it is larger than the sum of its proper divisors (805228143).

1216836369 is a wasteful number, since it uses less digits than its factorization.

1216836369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128077 (or 128074 counting only the distinct ones).

The product of its digits is 279936, while the sum is 45.

The square root of 1216836369 is about 34883.1817499494. The cubic root of 1216836369 is about 1067.6053148551.

The spelling of 1216836369 in words is "one billion, two hundred sixteen million, eight hundred thirty-six thousand, three hundred sixty-nine".