16909949 has 12 divisors (see below), whose sum is σ = 19740924. Its totient is φ = 14442624.

The previous prime is 16909927. The next prime is 16909957. The reversal of 16909949 is 94990961.

It can be written as a sum of positive squares in 2 ways, for example, as 4708900 + 12201049 = 2170^2 + 3493^2 .

It is not a de Polignac number, because 16909949 - 2⁸ = 16909693 is a prime.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16909969) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20819 + ... + 21615.

It is an arithmetic number, because the mean of its divisors is an integer number (1645077).

Almost surely, 2^16909949 is an apocalyptic number.

It is an amenable number.

16909949 is a deficient number, since it is larger than the sum of its proper divisors (2830975).

16909949 is an equidigital number, since it uses as much as digits as its factorization.

16909949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1244 (or 1237 counting only the distinct ones).

The product of its (nonzero) digits is 157464, while the sum is 47.

The square root of 16909949 is about 4112.1708378909. The cubic root of 16909949 is about 256.6733423424.

The spelling of 16909949 in words is "sixteen million, nine hundred nine thousand, nine hundred forty-nine".