43991642 has 8 divisors (see below), whose sum is σ = 66023316. Its totient is φ = 21983872.

The previous prime is 43991599. The next prime is 43991653. The reversal of 43991642 is 24619934.

43991642 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 39702601 + 4289041 = 6301^2 + 2071^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 43991596 and 43991605.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 293 + ... + 9384.

Almost surely, 2^43991642 is an apocalyptic number.

43991642 is a deficient number, since it is larger than the sum of its proper divisors (22031674).

43991642 is a wasteful number, since it uses less digits than its factorization.

43991642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11952.

The product of its digits is 46656, while the sum is 38.

The square root of 43991642 is about 6632.6195428352. The cubic root of 43991642 is about 353.0124785933.

The spelling of 43991642 in words is "forty-three million, nine hundred ninety-one thousand, six hundred forty-two".