16990709 has 4 divisors (see below), whose sum is σ = 16999104. Its totient is φ = 16982316.

The previous prime is 16990703. The next prime is 16990751. The reversal of 16990709 is 90709961.

It is a happy number.

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 not a de Polignac number, because 16990709 - 2¹⁶ = 16925173 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 (16990703) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 914 + ... + 5900.

It is an arithmetic number, because the mean of its divisors is an integer number (4249776).

Almost surely, 2^16990709 is an apocalyptic number.

It is an amenable number.

16990709 is a deficient number, since it is larger than the sum of its proper divisors (8395).

16990709 is an equidigital number, since it uses as much as digits as its factorization.

16990709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8394.

The product of its (nonzero) digits is 30618, while the sum is 41.

The square root of 16990709 is about 4121.9787723859. The cubic root of 16990709 is about 257.0813078291.

The spelling of 16990709 in words is "sixteen million, nine hundred ninety thousand, seven hundred nine".