11681812 has 6 divisors (see below), whose sum is σ = 20443178. Its totient is φ = 5840904.

The previous prime is 11681801. The next prime is 11681833. The reversal of 11681812 is 21818611.

It can be written as a sum of positive squares in only one way, i.e., 11532816 + 148996 = 3396^2 + 386^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1460223 + ... + 1460230.

Almost surely, 2^11681812 is an apocalyptic number.

It is an amenable number.

11681812 is a deficient number, since it is larger than the sum of its proper divisors (8761366).

11681812 is a wasteful number, since it uses less digits than its factorization.

11681812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2920457 (or 2920455 counting only the distinct ones).

The product of its digits is 768, while the sum is 28.

The square root of 11681812 is about 3417.8665860446. The cubic root of 11681812 is about 226.9011711822.

The spelling of 11681812 in words is "eleven million, six hundred eighty-one thousand, eight hundred twelve".