16390665 has 24 divisors (see below), whose sum is σ = 28574208. Its totient is φ = 8691360.

The previous prime is 16390637. The next prime is 16390681. The reversal of 16390665 is 56609361.

It is not a de Polignac number, because 16390665 - 2¹⁰ = 16389641 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

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 in 23 ways as a sum of consecutive naturals, for example, 7642 + ... + 9548.

It is an arithmetic number, because the mean of its divisors is an integer number (1190592).

Almost surely, 2^16390665 is an apocalyptic number.

16390665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16390665 is a deficient number, since it is larger than the sum of its proper divisors (12183543).

16390665 is a wasteful number, since it uses less digits than its factorization.

16390665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2109 (or 2106 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 36.

The square root of 16390665 is about 4048.5386252326. The cubic root of 16390665 is about 254.0186038412.

The spelling of 16390665 in words is "sixteen million, three hundred ninety thousand, six hundred sixty-five".