16981326 has 56 divisors (see below), whose sum is σ = 40266120. Its totient is φ = 5353776.

The previous prime is 16981319. The next prime is 16981331. The reversal of 16981326 is 62318961.

It is a congruent number.

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 27 ways as a sum of consecutive naturals, for example, 27396 + ... + 28008.

Almost surely, 2^16981326 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16981326, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20133060).

16981326 is an abundant number, since it is smaller than the sum of its proper divisors (23284794).

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

16981326 is an equidigital number, since it uses as much as digits as its factorization.

16981326 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 652 (or 637 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 16981326 is about 4120.8404482581. The cubic root of 16981326 is about 257.0339753313.

The spelling of 16981326 in words is "sixteen million, nine hundred eighty-one thousand, three hundred twenty-six".