12691212 has 24 divisors (see below), whose sum is σ = 30634800. Its totient is φ = 4084416.

The previous prime is 12691199. The next prime is 12691213. The reversal of 12691212 is 21219621.

It is a super-2 number, since 2×12691212² = 322133724057888, 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 7 ways as a sum of consecutive naturals, for example, 17887 + ... + 18582.

It is an arithmetic number, because the mean of its divisors is an integer number (1276450).

Almost surely, 2^12691212 is an apocalyptic number.

12691212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12691212 is an abundant number, since it is smaller than the sum of its proper divisors (17943588).

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

12691212 is a wasteful number, since it uses less digits than its factorization.

12691212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36505 (or 36503 counting only the distinct ones).

The product of its digits is 432, while the sum is 24.

The square root of 12691212 is about 3562.4727367378. The cubic root of 12691212 is about 233.2568284332.

The spelling of 12691212 in words is "twelve million, six hundred ninety-one thousand, two hundred twelve".