12691216 has 20 divisors (see below), whose sum is σ = 25659072. Its totient is φ = 6069536.

The previous prime is 12691213. The next prime is 12691219. The reversal of 12691216 is 61219621.

It is an interprime number because it is at equal distance from previous prime (12691213) and next prime (12691219).

It is a super-2 number, since 2×12691216² = 322133927117312, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12691213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16876 + ... + 17611.

Almost surely, 2^12691216 is an apocalyptic number.

12691216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

12691216 is an abundant number, since it is smaller than the sum of its proper divisors (12967856).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12691216 is a wasteful number, since it uses less digits than its factorization.

12691216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34518 (or 34512 counting only the distinct ones).

The product of its digits is 1296, while the sum is 28.

The square root of 12691216 is about 3562.4732981455. The cubic root of 12691216 is about 233.2568529391.

It can be divided in two parts, 1269 and 1216, that added together give a triangular number (2485 = T₇₀).

The spelling of 12691216 in words is "twelve million, six hundred ninety-one thousand, two hundred sixteen".