43981216 has 12 divisors (see below), whose sum is σ = 86588082. Its totient is φ = 21990592.

The previous prime is 43981213. The next prime is 43981241. The reversal of 43981216 is 61218934.

It can be written as a sum of positive squares in only one way, i.e., 43824400 + 156816 = 6620^2 + 396^2 .

It is not an unprimeable number, because it can be changed into a prime (43981211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 687175 + ... + 687238.

Almost surely, 2^43981216 is an apocalyptic number.

It is an amenable number.

43981216 is a deficient number, since it is larger than the sum of its proper divisors (42606866).

43981216 is a wasteful number, since it uses less digits than its factorization.

43981216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1374423 (or 1374415 counting only the distinct ones).

The product of its digits is 10368, while the sum is 34.

The square root of 43981216 is about 6631.8335322895. The cubic root of 43981216 is about 352.9845884553.

The spelling of 43981216 in words is "forty-three million, nine hundred eighty-one thousand, two hundred sixteen".