12691684 has 6 divisors (see below), whose sum is σ = 22210454. Its totient is φ = 6345840.

The previous prime is 12691649. The next prime is 12691691. The reversal of 12691684 is 48619621.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 10381284 + 2310400 = 3222^2 + 1520^2 .

It is a super-2 number, since 2×12691684² = 322157685511712, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1586457 + ... + 1586464.

Almost surely, 2^12691684 is an apocalyptic number.

It is an amenable number.

12691684 is a deficient number, since it is larger than the sum of its proper divisors (9518770).

12691684 is a wasteful number, since it uses less digits than its factorization.

12691684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3172925 (or 3172923 counting only the distinct ones).

The product of its digits is 20736, while the sum is 37.

The square root of 12691684 is about 3562.5389822429. The cubic root of 12691684 is about 233.2597200892.

The spelling of 12691684 in words is "twelve million, six hundred ninety-one thousand, six hundred eighty-four".