16666338 has 32 divisors (see below), whose sum is σ = 36400896. Its totient is φ = 5056128.

The previous prime is 16666319. The next prime is 16666343. The reversal of 16666338 is 83366661.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a junction number, because it is equal to n+sod(n) for n = 16666296 and 16666305.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4231 + ... + 7157.

It is an arithmetic number, because the mean of its divisors is an integer number (1137528).

Almost surely, 2^16666338 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16666338, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18200448).

16666338 is an abundant number, since it is smaller than the sum of its proper divisors (19734558).

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

16666338 is a wasteful number, since it uses less digits than its factorization.

16666338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3018.

The product of its digits is 93312, while the sum is 39.

The square root of 16666338 is about 4082.4426511587. The cubic root of 16666338 is about 255.4347983844.

The spelling of 16666338 in words is "sixteen million, six hundred sixty-six thousand, three hundred thirty-eight".