16668138 has 8 divisors (see below), whose sum is σ = 33336288. Its totient is φ = 5556044.

The previous prime is 16668137. The next prime is 16668209. The reversal of 16668138 is 83186661.

It is a sphenic number, since it is the product of 3 distinct primes.

16668138 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 16668096 and 16668105.

It is not an unprimeable number, because it can be changed into a prime (16668137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1389006 + ... + 1389017.

It is an arithmetic number, because the mean of its divisors is an integer number (4167036).

Almost surely, 2^16668138 is an apocalyptic number.

16668138 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

16668138 is a wasteful number, since it uses less digits than its factorization.

16668138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2778028.

The product of its digits is 41472, while the sum is 39.

The square root of 16668138 is about 4082.6631014572. The cubic root of 16668138 is about 255.4439938874.

The spelling of 16668138 in words is "sixteen million, six hundred sixty-eight thousand, one hundred thirty-eight".