43986961 has 4 divisors (see below), whose sum is σ = 44061732. Its totient is φ = 43912192.

The previous prime is 43986941. The next prime is 43986991. The reversal of 43986961 is 16968934.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16968934 = 2 ⋅8484467.

It can be written as a sum of positive squares in 2 ways, for example, as 21566736 + 22420225 = 4644^2 + 4735^2 .

It is a cyclic number.

It is not a de Polignac number, because 43986961 - 2¹⁵ = 43954193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43986911) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 36496 + ... + 37681.

It is an arithmetic number, because the mean of its divisors is an integer number (11015433).

Almost surely, 2^43986961 is an apocalyptic number.

It is an amenable number.

43986961 is a deficient number, since it is larger than the sum of its proper divisors (74771).

43986961 is an equidigital number, since it uses as much as digits as its factorization.

43986961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74770.

The product of its digits is 279936, while the sum is 46.

The square root of 43986961 is about 6632.2666562797. The cubic root of 43986961 is about 352.9999571994. Note that the first 4 decimals are identical.

The spelling of 43986961 in words is "forty-three million, nine hundred eighty-six thousand, nine hundred sixty-one".