43920981 has 16 divisors (see below), whose sum is σ = 70073920. Its totient is φ = 27028080.

The previous prime is 43920977. The next prime is 43920997. The reversal of 43920981 is 18902934.

It is not a de Polignac number, because 43920981 - 2² = 43920977 is a prime.

It is a super-2 number, since 2×43920981² = 3858105144004722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43920901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62215 + ... + 62916.

It is an arithmetic number, because the mean of its divisors is an integer number (4379620).

Almost surely, 2^43920981 is an apocalyptic number.

It is an amenable number.

43920981 is a deficient number, since it is larger than the sum of its proper divisors (26152939).

43920981 is a wasteful number, since it uses less digits than its factorization.

43920981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125153 (or 125147 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 43920981 is about 6627.2906228715. The cubic root of 43920981 is about 352.8233700795.

The spelling of 43920981 in words is "forty-three million, nine hundred twenty thousand, nine hundred eighty-one".