43421908 has 6 divisors (see below), whose sum is σ = 75988346. Its totient is φ = 21710952.

The previous prime is 43421881. The next prime is 43421909. The reversal of 43421908 is 80912434.

It can be written as a sum of positive squares in only one way, i.e., 43401744 + 20164 = 6588^2 + 142^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 43421908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43421909) 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, 5427735 + ... + 5427742.

Almost surely, 2^43421908 is an apocalyptic number.

It is an amenable number.

43421908 is a deficient number, since it is larger than the sum of its proper divisors (32566438).

43421908 is a wasteful number, since it uses less digits than its factorization.

43421908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10855481 (or 10855479 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 43421908 is about 6589.5301805212. The cubic root of 43421908 is about 351.4819017989.

The spelling of 43421908 in words is "forty-three million, four hundred twenty-one thousand, nine hundred eight".