43868681 has 2 divisors, whose sum is σ = 43868682. Its totient is φ = 43868680.

The previous prime is 43868651. The next prime is 43868711. The reversal of 43868681 is 18686834.

It is a balanced prime because it is at equal distance from previous prime (43868651) and next prime (43868711).

It can be written as a sum of positive squares in only one way, i.e., 28783225 + 15085456 = 5365^2 + 3884^2 .

It is a cyclic number.

It is not a de Polignac number, because 43868681 - 2¹⁴ = 43852297 is a prime.

It is a super-2 number, since 2×43868681² = 3848922345359522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (43868641) 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, 21934340 + 21934341.

It is an arithmetic number, because the mean of its divisors is an integer number (21934341).

Almost surely, 2^43868681 is an apocalyptic number.

It is an amenable number.

43868681 is a deficient number, since it is larger than the sum of its proper divisors (1).

43868681 is an equidigital number, since it uses as much as digits as its factorization.

43868681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 221184, while the sum is 44.

The square root of 43868681 is about 6623.3436419984. The cubic root of 43868681 is about 352.6832700558.

The spelling of 43868681 in words is "forty-three million, eight hundred sixty-eight thousand, six hundred eighty-one".