43644136 has 16 divisors (see below), whose sum is σ = 82175940. Its totient is φ = 21730560.

The previous prime is 43644119. The next prime is 43644143. The reversal of 43644136 is 63144634.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 43639236 + 4900 = 6606^2 + 70^2 .

It is a junction number, because it is equal to n+sod(n) for n = 43644098 and 43644107.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9391 + ... + 13246.

Almost surely, 2^43644136 is an apocalyptic number.

It is an amenable number.

43644136 is a deficient number, since it is larger than the sum of its proper divisors (38531804).

43644136 is a wasteful number, since it uses less digits than its factorization.

43644136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22884 (or 22880 counting only the distinct ones).

The product of its digits is 20736, while the sum is 31.

The square root of 43644136 is about 6606.3708645519. The cubic root of 43644136 is about 352.0804955371.

The spelling of 43644136 in words is "forty-three million, six hundred forty-four thousand, one hundred thirty-six".