16381806 has 16 divisors (see below), whose sum is σ = 37444224. Its totient is φ = 4680504.

The previous prime is 16381801. The next prime is 16381847. The reversal of 16381806 is 60818361.

It is a Curzon number.

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 7 ways as a sum of consecutive naturals, for example, 194980 + ... + 195063.

It is an arithmetic number, because the mean of its divisors is an integer number (2340264).

Almost surely, 2^16381806 is an apocalyptic number.

16381806 is an abundant number, since it is smaller than the sum of its proper divisors (21062418).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16381806 is a wasteful number, since it uses less digits than its factorization.

16381806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390055.

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 16381806 is about 4047.4443788643. Note that the first 3 decimals coincide. The cubic root of 16381806 is about 253.9728307063.

The spelling of 16381806 in words is "sixteen million, three hundred eighty-one thousand, eight hundred six".