16993209 has 16 divisors (see below), whose sum is σ = 23080640. Its totient is φ = 11119680.

The previous prime is 16993199. The next prime is 16993237. The reversal of 16993209 is 90239961.

It is a happy number.

It is not a de Polignac number, because 16993209 - 2¹² = 16989113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16993289) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51174 + ... + 51504.

It is an arithmetic number, because the mean of its divisors is an integer number (1442540).

Almost surely, 2^16993209 is an apocalyptic number.

It is an amenable number.

16993209 is a deficient number, since it is larger than the sum of its proper divisors (6087431).

16993209 is a wasteful number, since it uses less digits than its factorization.

16993209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 600.

The product of its (nonzero) digits is 26244, while the sum is 39.

The square root of 16993209 is about 4122.2820136424. The cubic root of 16993209 is about 257.0939161268.

The spelling of 16993209 in words is "sixteen million, nine hundred ninety-three thousand, two hundred nine".