16381805 has 16 divisors (see below), whose sum is σ = 21600000. Its totient is φ = 11828160.

The previous prime is 16381801. The next prime is 16381847. The reversal of 16381805 is 50818361.

It is not a de Polignac number, because 16381805 - 2² = 16381801 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16381801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7196 + ... + 9194.

It is an arithmetic number, because the mean of its divisors is an integer number (1350000).

Almost surely, 2^16381805 is an apocalyptic number.

It is an amenable number.

16381805 is a deficient number, since it is larger than the sum of its proper divisors (5218195).

16381805 is a wasteful number, since it uses less digits than its factorization.

16381805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2164.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 16381805 is about 4047.4442553295. Note that the first 3 decimals coincide. The cubic root of 16381805 is about 253.9728255385.

It can be divided in two parts, 1638 and 1805, that added together give a palindrome (3443).

The spelling of 16381805 in words is "sixteen million, three hundred eighty-one thousand, eight hundred five".