16986917 has 4 divisors (see below), whose sum is σ = 16997376. Its totient is φ = 16976460.

The previous prime is 16986913. The next prime is 16986923. The reversal of 16986917 is 71968961.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 71968961 = 1609 ⋅44729.

It is a cyclic number.

It is not a de Polignac number, because 16986917 - 2² = 16986913 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16986911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2213 + ... + 6234.

It is an arithmetic number, because the mean of its divisors is an integer number (4249344).

Almost surely, 2^16986917 is an apocalyptic number.

It is an amenable number.

16986917 is a deficient number, since it is larger than the sum of its proper divisors (10459).

16986917 is an equidigital number, since it uses as much as digits as its factorization.

16986917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10458.

The product of its digits is 163296, while the sum is 47.

The square root of 16986917 is about 4121.5187734620. The cubic root of 16986917 is about 257.0621812023.

The spelling of 16986917 in words is "sixteen million, nine hundred eighty-six thousand, nine hundred seventeen".