16938309 has 8 divisors (see below), whose sum is σ = 22720320. Its totient is φ = 11224256.

The previous prime is 16938301. The next prime is 16938319. The reversal of 16938309 is 90383961.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16938309 - 2³ = 16938301 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16938301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16404 + ... + 17405.

It is an arithmetic number, because the mean of its divisors is an integer number (2840040).

Almost surely, 2^16938309 is an apocalyptic number.

It is an amenable number.

16938309 is a deficient number, since it is larger than the sum of its proper divisors (5782011).

16938309 is a wasteful number, since it uses less digits than its factorization.

16938309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33979.

The product of its (nonzero) digits is 34992, while the sum is 39.

The square root of 16938309 is about 4115.6176936154. The cubic root of 16938309 is about 256.8167527963.

The spelling of 16938309 in words is "sixteen million, nine hundred thirty-eight thousand, three hundred nine".