43638634 has 8 divisors (see below), whose sum is σ = 70493220. Its totient is φ = 20140896.

The previous prime is 43638631. The next prime is 43638671. The reversal of 43638634 is 43683634.

It can be written as a sum of positive squares in 2 ways, for example, as 34047225 + 9591409 = 5835^2 + 3097^2 .

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 = 43638593 and 43638602.

It is not an unprimeable number, because it can be changed into a prime (43638631) 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, 839179 + ... + 839230.

Almost surely, 2^43638634 is an apocalyptic number.

43638634 is a deficient number, since it is larger than the sum of its proper divisors (26854586).

43638634 is a wasteful number, since it uses less digits than its factorization.

43638634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1678424.

The product of its digits is 124416, while the sum is 37.

The square root of 43638634 is about 6605.9544352047. The cubic root of 43638634 is about 352.0656999008.

The spelling of 43638634 in words is "forty-three million, six hundred thirty-eight thousand, six hundred thirty-four".