16443904 has 20 divisors (see below), whose sum is σ = 32856714. Its totient is φ = 8221696.

The previous prime is 16443901. The next prime is 16443971. The reversal of 16443904 is 40934461.

It can be written as a sum of positive squares in only one way, i.e., 16386304 + 57600 = 4048^2 + 240^2 .

It is a super-3 number, since 3×16443904³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (16443901) 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, 15547 + ... + 16570.

Almost surely, 2^16443904 is an apocalyptic number.

It is an amenable number.

16443904 is a deficient number, since it is larger than the sum of its proper divisors (16412810).

16443904 is an frugal number, since it uses more digits than its factorization.

16443904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32135 (or 32119 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 16443904 is about 4055.1083832618. The cubic root of 16443904 is about 254.2933350287.

The spelling of 16443904 in words is "sixteen million, four hundred forty-three thousand, nine hundred four".