16798509 has 80 divisors (see below), whose sum is σ = 32199552. Its totient is φ = 8491392.

The previous prime is 16798501. The next prime is 16798517. The reversal of 16798509 is 90589761.

It is an interprime number because it is at equal distance from previous prime (16798501) and next prime (16798517).

It is not a de Polignac number, because 16798509 - 2³ = 16798501 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16798501) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 316927 + ... + 316979.

Almost surely, 2^16798509 is an apocalyptic number.

It is an amenable number.

16798509 is a deficient number, since it is larger than the sum of its proper divisors (15401043).

16798509 is a wasteful number, since it uses less digits than its factorization.

16798509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128 (or 119 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 45.

The square root of 16798509 is about 4098.5984189720. The cubic root of 16798509 is about 256.1082560133.

The spelling of 16798509 in words is "sixteen million, seven hundred ninety-eight thousand, five hundred nine".