16128909 has 8 divisors (see below), whose sum is σ = 23894720. Its totient is φ = 10752588.

The previous prime is 16128887. The next prime is 16128941. The reversal of 16128909 is 90982161.

It is not a de Polignac number, because 16128909 - 2¹¹ = 16126861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16128989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 298657 + ... + 298710.

It is an arithmetic number, because the mean of its divisors is an integer number (2986840).

Almost surely, 2^16128909 is an apocalyptic number.

It is an amenable number.

16128909 is a deficient number, since it is larger than the sum of its proper divisors (7765811).

16128909 is an equidigital number, since it uses as much as digits as its factorization.

16128909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 597376 (or 597370 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 36.

The square root of 16128909 is about 4016.0812989779. The cubic root of 16128909 is about 252.6591304861.

The spelling of 16128909 in words is "sixteen million, one hundred twenty-eight thousand, nine hundred nine".