16381816 has 16 divisors (see below), whose sum is σ = 33508440. Its totient is φ = 7446240.

The previous prime is 16381801. The next prime is 16381847. The reversal of 16381816 is 61818361.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 92991 + ... + 93166.

Almost surely, 2^16381816 is an apocalyptic number.

It is an amenable number.

16381816 is an abundant number, since it is smaller than the sum of its proper divisors (17126624).

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

16381816 is a wasteful number, since it uses less digits than its factorization.

16381816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186174 (or 186170 counting only the distinct ones).

The product of its digits is 6912, while the sum is 34.

The square root of 16381816 is about 4047.4456142115. The cubic root of 16381816 is about 253.9728823841.

The spelling of 16381816 in words is "sixteen million, three hundred eighty-one thousand, eight hundred sixteen".