11983681 has 4 divisors (see below), whose sum is σ = 12028500. Its totient is φ = 11938864.

The previous prime is 11983669. The next prime is 11983693. The reversal of 11983681 is 18638911.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (11983669) and next prime (11983693).

It can be written as a sum of positive squares in 2 ways, for example, as 1199025 + 10784656 = 1095^2 + 3284^2 .

It is a cyclic number.

It is not a de Polignac number, because 11983681 - 2¹⁷ = 11852609 is a prime.

It is a super-2 number, since 2×11983681² = 287217220619522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11983681.

It is not an unprimeable number, because it can be changed into a prime (11983381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22006 + ... + 22543.

It is an arithmetic number, because the mean of its divisors is an integer number (3007125).

Almost surely, 2^11983681 is an apocalyptic number.

It is an amenable number.

11983681 is a deficient number, since it is larger than the sum of its proper divisors (44819).

11983681 is an equidigital number, since it uses as much as digits as its factorization.

11983681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44818.

The product of its digits is 10368, while the sum is 37.

The square root of 11983681 is about 3461.7453690299. The cubic root of 11983681 is about 228.8390203654.

The spelling of 11983681 in words is "eleven million, nine hundred eighty-three thousand, six hundred eighty-one".