16128865 has 16 divisors (see below), whose sum is σ = 20361600. Its totient is φ = 12241152.

The previous prime is 16128863. The next prime is 16128883. The reversal of 16128865 is 56882161.

It is not a de Polignac number, because 16128865 - 2¹ = 16128863 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16128863) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 15481 + ... + 16489.

It is an arithmetic number, because the mean of its divisors is an integer number (1272600).

Almost surely, 2^16128865 is an apocalyptic number.

It is an amenable number.

16128865 is a deficient number, since it is larger than the sum of its proper divisors (4232735).

16128865 is a wasteful number, since it uses less digits than its factorization.

16128865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1176.

The product of its digits is 23040, while the sum is 37.

The square root of 16128865 is about 4016.0758209974. The cubic root of 16128865 is about 252.6589007328.

It can be divided in two parts, 16 and 128865, that added together give a square (128881 = 359²).

The spelling of 16128865 in words is "sixteen million, one hundred twenty-eight thousand, eight hundred sixty-five".