43939881 has 8 divisors (see below), whose sum is σ = 65096160. Its totient is φ = 29293236.

The previous prime is 43939859. The next prime is 43939897. The reversal of 43939881 is 18893934.

43939881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 43939881 - 2⁶ = 43939817 is a prime.

It is a super-2 number, since 2×43939881² = 3861426284588322, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (43939081) 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 7 ways as a sum of consecutive naturals, for example, 813675 + ... + 813728.

It is an arithmetic number, because the mean of its divisors is an integer number (8137020).

Almost surely, 2^43939881 is an apocalyptic number.

It is an amenable number.

43939881 is a deficient number, since it is larger than the sum of its proper divisors (21156279).

43939881 is a wasteful number, since it uses less digits than its factorization.

43939881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1627412 (or 1627406 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 43939881 is about 6628.7163915799. The cubic root of 43939881 is about 352.8739716011.

The spelling of 43939881 in words is "forty-three million, nine hundred thirty-nine thousand, eight hundred eighty-one".