16866442 has 8 divisors (see below), whose sum is σ = 25532100. Its totient is φ = 8355744.

The previous prime is 16866427. The next prime is 16866491. The reversal of 16866442 is 24466861.

It can be written as a sum of positive squares in 2 ways, for example, as 15848361 + 1018081 = 3981^2 + 1009^2 .

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

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, 38467 + ... + 38902.

Almost surely, 2^16866442 is an apocalyptic number.

16866442 is a deficient number, since it is larger than the sum of its proper divisors (8665658).

16866442 is a wasteful number, since it uses less digits than its factorization.

16866442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77480.

The product of its digits is 55296, while the sum is 37.

The square root of 16866442 is about 4106.8774026016. The cubic root of 16866442 is about 256.4530247462.

It can be divided in two parts, 1686 and 6442, that added together give a triangular number (8128 = T₁₂₇).

The spelling of 16866442 in words is "sixteen million, eight hundred sixty-six thousand, four hundred forty-two".