43708981 has 4 divisors (see below), whose sum is σ = 43931052. Its totient is φ = 43486912.

The previous prime is 43708979. The next prime is 43708999. The reversal of 43708981 is 18980734.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21298225 + 22410756 = 4615^2 + 4734^2 .

It is a cyclic number.

It is not a de Polignac number, because 43708981 - 2¹ = 43708979 is a prime.

It is a super-2 number, since 2×43708981² = 3820950040116722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43708961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110740 + ... + 111133.

It is an arithmetic number, because the mean of its divisors is an integer number (10982763).

Almost surely, 2^43708981 is an apocalyptic number.

It is an amenable number.

43708981 is a deficient number, since it is larger than the sum of its proper divisors (222071).

43708981 is a wasteful number, since it uses less digits than its factorization.

43708981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222070.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 43708981 is about 6611.2768055800. The cubic root of 43708981 is about 352.2547790655.

The spelling of 43708981 in words is "forty-three million, seven hundred eight thousand, nine hundred eighty-one".