43990816 has 12 divisors (see below), whose sum is σ = 86606982. Its totient is φ = 21995392.

The previous prime is 43990799. The next prime is 43990823. The reversal of 43990816 is 61809934.

It can be written as a sum of positive squares in only one way, i.e., 37210000 + 6780816 = 6100^2 + 2604^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 687325 + ... + 687388.

Almost surely, 2^43990816 is an apocalyptic number.

It is an amenable number.

43990816 is a deficient number, since it is larger than the sum of its proper divisors (42616166).

43990816 is a wasteful number, since it uses less digits than its factorization.

43990816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1374723 (or 1374715 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 43990816 is about 6632.5572745360. The cubic root of 43990816 is about 353.0102691574.

The spelling of 43990816 in words is "forty-three million, nine hundred ninety thousand, eight hundred sixteen".