16866538 has 24 divisors (see below), whose sum is σ = 27669600. Its totient is φ = 7707024.

The previous prime is 16866527. The next prime is 16866541. The reversal of 16866538 is 83566861.

It is a junction number, because it is equal to n+sod(n) for n = 16866494 and 16866503.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 46803 + ... + 47161.

It is an arithmetic number, because the mean of its divisors is an integer number (1152900).

Almost surely, 2^16866538 is an apocalyptic number.

16866538 is a deficient number, since it is larger than the sum of its proper divisors (10803062).

16866538 is a wasteful number, since it uses less digits than its factorization.

16866538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 526 (or 513 counting only the distinct ones).

The product of its digits is 207360, while the sum is 43.

The square root of 16866538 is about 4106.8890902969. The cubic root of 16866538 is about 256.4535113029.

The spelling of 16866538 in words is "sixteen million, eight hundred sixty-six thousand, five hundred thirty-eight".