16990786 has 8 divisors (see below), whose sum is σ = 26985420. Its totient is φ = 7995648.

The previous prime is 16990783. The next prime is 16990789. The reversal of 16990786 is 68709961.

It is an interprime number because it is at equal distance from previous prime (16990783) and next prime (16990789).

It can be written as a sum of positive squares in 2 ways, for example, as 13549761 + 3441025 = 3681^2 + 1855^2 .

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

It is not an unprimeable number, because it can be changed into a prime (16990783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 249831 + ... + 249898.

Almost surely, 2^16990786 is an apocalyptic number.

16990786 is a deficient number, since it is larger than the sum of its proper divisors (9994634).

16990786 is a wasteful number, since it uses less digits than its factorization.

16990786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 499748.

The product of its (nonzero) digits is 163296, while the sum is 46.

The square root of 16990786 is about 4121.9881125496. The cubic root of 16990786 is about 257.0816961831.

The spelling of 16990786 in words is "sixteen million, nine hundred ninety thousand, seven hundred eighty-six".