16668438 has 8 divisors (see below), whose sum is σ = 33336888. Its totient is φ = 5556144.

The previous prime is 16668419. The next prime is 16668451. The reversal of 16668438 is 83486661.

It is a happy number.

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

16668438 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 16668438.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1389031 + ... + 1389042.

It is an arithmetic number, because the mean of its divisors is an integer number (4167111).

Almost surely, 2^16668438 is an apocalyptic number.

16668438 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.

16668438 is a wasteful number, since it uses less digits than its factorization.

16668438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2778078.

The product of its digits is 165888, while the sum is 42.

The square root of 16668438 is about 4082.6998420163. The cubic root of 16668438 is about 255.4455264069.

The spelling of 16668438 in words is "sixteen million, six hundred sixty-eight thousand, four hundred thirty-eight".