43981713 has 18 divisors (see below), whose sum is σ = 67053714. Its totient is φ = 27775872.

The previous prime is 43981711. The next prime is 43981739. The reversal of 43981713 is 31718934.

43981713 = T₃₀₂ + T₃₀₃ + ... + T₆₆₂.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 43718544 + 263169 = 6612^2 + 513^2 .

It is not a de Polignac number, because 43981713 - 2¹ = 43981711 is a prime.

It is not an unprimeable number, because it can be changed into a prime (43981711) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 3520 + ... + 10017.

Almost surely, 2^43981713 is an apocalyptic number.

It is an amenable number.

43981713 is a deficient number, since it is larger than the sum of its proper divisors (23072001).

43981713 is a wasteful number, since it uses less digits than its factorization.

43981713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13581 (or 13559 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 43981713 is about 6631.8710029674. The cubic root of 43981713 is about 352.9859180584.

The spelling of 43981713 in words is "forty-three million, nine hundred eighty-one thousand, seven hundred thirteen".