16389909 has 6 divisors (see below), whose sum is σ = 23674326. Its totient is φ = 10926600.

The previous prime is 16389899. The next prime is 16389929. The reversal of 16389909 is 90998361.

16389909 is a `hidden beast` number, since 1 + 638 + 9 + 9 + 0 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 14607684 + 1782225 = 3822^2 + 1335^2 .

It is not a de Polignac number, because 16389909 - 2²¹ = 14292757 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16389929) 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 5 ways as a sum of consecutive naturals, for example, 910542 + ... + 910559.

It is an arithmetic number, because the mean of its divisors is an integer number (3945721).

Almost surely, 2^16389909 is an apocalyptic number.

It is an amenable number.

16389909 is a deficient number, since it is larger than the sum of its proper divisors (7284417).

16389909 is a wasteful number, since it uses less digits than its factorization.

16389909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1821107 (or 1821104 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 45.

The square root of 16389909 is about 4048.4452571327. The cubic root of 16389909 is about 254.0146983455.

The spelling of 16389909 in words is "sixteen million, three hundred eighty-nine thousand, nine hundred nine".