16440128 has 14 divisors (see below), whose sum is σ = 32623506. Its totient is φ = 8220032.

The previous prime is 16440119. The next prime is 16440131. The reversal of 16440128 is 82104461.

It can be written as a sum of positive squares in only one way, i.e., 16386304 + 53824 = 4048^2 + 232^2 .

It is a super-3 number, since 3×16440128³ (a number of 23 digits) contains 333 as substring.

It is a nialpdrome in base 8.

It is a junction number, because it is equal to n+sod(n) for n = 16440097 and 16440106.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128375 + ... + 128502.

Almost surely, 2^16440128 is an apocalyptic number.

It is an amenable number.

16440128 is a deficient number, since it is larger than the sum of its proper divisors (16183378).

16440128 is an equidigital number, since it uses as much as digits as its factorization.

16440128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256889 (or 256879 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 16440128 is about 4054.6427709479. The cubic root of 16440128 is about 254.2738691496.

Adding to 16440128 its reverse (82104461), we get a palindrome (98544589).

The spelling of 16440128 in words is "sixteen million, four hundred forty thousand, one hundred twenty-eight".