12691828 has 6 divisors (see below), whose sum is σ = 22210706. Its totient is φ = 6345912.

The previous prime is 12691823. The next prime is 12691831. The reversal of 12691828 is 82819621.

It can be written as a sum of positive squares in only one way, i.e., 8456464 + 4235364 = 2908^2 + 2058^2 .

It is a super-2 number, since 2×12691828² = 322164995963168, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12691823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1586475 + ... + 1586482.

Almost surely, 2^12691828 is an apocalyptic number.

It is an amenable number.

12691828 is a deficient number, since it is larger than the sum of its proper divisors (9518878).

12691828 is a wasteful number, since it uses less digits than its factorization.

12691828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3172961 (or 3172959 counting only the distinct ones).

The product of its digits is 13824, while the sum is 37.

The square root of 12691828 is about 3562.5591924907. The cubic root of 12691828 is about 233.2606022751.

The spelling of 12691828 in words is "twelve million, six hundred ninety-one thousand, eight hundred twenty-eight".