43881985 has 16 divisors (see below), whose sum is σ = 61082496. Its totient is φ = 29639808.

The previous prime is 43881961. The next prime is 43881991. The reversal of 43881985 is 58918834.

It is a cyclic number.

It is not a de Polignac number, because 43881985 - 2⁹ = 43881473 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 7012 + ... + 11701.

It is an arithmetic number, because the mean of its divisors is an integer number (3817656).

Almost surely, 2^43881985 is an apocalyptic number.

It is an amenable number.

43881985 is a deficient number, since it is larger than the sum of its proper divisors (17200511).

43881985 is a wasteful number, since it uses less digits than its factorization.

43881985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18792.

The product of its digits is 276480, while the sum is 46.

The square root of 43881985 is about 6624.3478924344. The cubic root of 43881985 is about 352.7189190570.

It can be divided in two parts, 4388198 and 5, that added together give a triangular number (4388203 = T₂₉₆₂).

The spelling of 43881985 in words is "forty-three million, eight hundred eighty-one thousand, nine hundred eighty-five".