43856881 has 2 divisors, whose sum is σ = 43856882. Its totient is φ = 43856880.

The previous prime is 43856873. The next prime is 43856899. The reversal of 43856881 is 18865834.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33744481 + 10112400 = 5809^2 + 3180^2 .

It is a cyclic number.

It is not a de Polignac number, because 43856881 - 2³ = 43856873 is a prime.

It is a super-2 number, since 2×43856881² = 3846852022096322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (43856801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21928440 + 21928441.

It is an arithmetic number, because the mean of its divisors is an integer number (21928441).

Almost surely, 2^43856881 is an apocalyptic number.

It is an amenable number.

43856881 is a deficient number, since it is larger than the sum of its proper divisors (1).

43856881 is an equidigital number, since it uses as much as digits as its factorization.

43856881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 184320, while the sum is 43.

The square root of 43856881 is about 6622.4527933387. The cubic root of 43856881 is about 352.6516450963.

The spelling of 43856881 in words is "forty-three million, eight hundred fifty-six thousand, eight hundred eighty-one".