16939009 has 4 divisors (see below), whose sum is σ = 16974000. Its totient is φ = 16904020.

The previous prime is 16939001. The next prime is 16939037. The reversal of 16939009 is 90093961.

16939009 is nontrivially palindromic in base 8.

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.

It is a cyclic number.

It is not a de Polignac number, because 16939009 - 2³ = 16939001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16939001) 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, 16759 + ... + 17740.

It is an arithmetic number, because the mean of its divisors is an integer number (4243500).

Almost surely, 2^16939009 is an apocalyptic number.

It is an amenable number.

16939009 is a deficient number, since it is larger than the sum of its proper divisors (34991).

16939009 is an equidigital number, since it uses as much as digits as its factorization.

16939009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34990.

The product of its (nonzero) digits is 13122, while the sum is 37.

The square root of 16939009 is about 4115.7027346493. The cubic root of 16939009 is about 256.8202905216.

The spelling of 16939009 in words is "sixteen million, nine hundred thirty-nine thousand, nine".