16988449 has 4 divisors (see below), whose sum is σ = 16997680. Its totient is φ = 16979220.

The previous prime is 16988399. The next prime is 16988501. The reversal of 16988449 is 94488961.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16988449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16988149) 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, 807 + ... + 5884.

It is an arithmetic number, because the mean of its divisors is an integer number (4249420).

Almost surely, 2^16988449 is an apocalyptic number.

It is an amenable number.

16988449 is a deficient number, since it is larger than the sum of its proper divisors (9231).

16988449 is an equidigital number, since it uses as much as digits as its factorization.

16988449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9230.

The product of its digits is 497664, while the sum is 49.

The square root of 16988449 is about 4121.7046230898. The cubic root of 16988449 is about 257.0699088636.

The spelling of 16988449 in words is "sixteen million, nine hundred eighty-eight thousand, four hundred forty-nine".