43438664 has 8 divisors (see below), whose sum is σ = 81447510. Its totient is φ = 21719328.

The previous prime is 43438601. The next prime is 43438667. The reversal of 43438664 is 46683434.

It can be written as a sum of positive squares in only one way, i.e., 27772900 + 15665764 = 5270^2 + 3958^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (43438667) 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 as a sum of consecutive naturals, namely, 2714909 + ... + 2714924.

Almost surely, 2^43438664 is an apocalyptic number.

It is an amenable number.

43438664 is a deficient number, since it is larger than the sum of its proper divisors (38008846).

43438664 is a wasteful number, since it uses less digits than its factorization.

43438664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5429839 (or 5429835 counting only the distinct ones).

The product of its digits is 165888, while the sum is 38.

The square root of 43438664 is about 6590.8014687138. The cubic root of 43438664 is about 351.5271068857.

The spelling of 43438664 in words is "forty-three million, four hundred thirty-eight thousand, six hundred sixty-four".