43521616 has 10 divisors (see below), whose sum is σ = 84323162. Its totient is φ = 21760800.

The previous prime is 43521593. The next prime is 43521617. The reversal of 43521616 is 61612534.

It can be written as a sum of positive squares in only one way, i.e., 43507216 + 14400 = 6596^2 + 120^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43521617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1360035 + ... + 1360066.

Almost surely, 2^43521616 is an apocalyptic number.

It is an amenable number.

43521616 is a deficient number, since it is larger than the sum of its proper divisors (40801546).

43521616 is a wasteful number, since it uses less digits than its factorization.

43521616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2720109 (or 2720103 counting only the distinct ones).

The product of its digits is 4320, while the sum is 28.

The square root of 43521616 is about 6597.0914803419. The cubic root of 43521616 is about 351.7507274423.

The spelling of 43521616 in words is "forty-three million, five hundred twenty-one thousand, six hundred sixteen".