16687949 has 8 divisors (see below), whose sum is σ = 17476992. Its totient is φ = 15904240.

The previous prime is 16687939. The next prime is 16687997. The reversal of 16687949 is 94978661.

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 16687949 - 2⁴ = 16687933 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 16687897 and 16687906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16687919) 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, 5987 + ... + 8319.

It is an arithmetic number, because the mean of its divisors is an integer number (2184624).

Almost surely, 2^16687949 is an apocalyptic number.

It is an amenable number.

16687949 is a deficient number, since it is larger than the sum of its proper divisors (789043).

16687949 is a wasteful number, since it uses less digits than its factorization.

16687949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2667.

The product of its digits is 653184, while the sum is 50.

The square root of 16687949 is about 4085.0886159299. The cubic root of 16687949 is about 255.5451569038.

The spelling of 16687949 in words is "sixteen million, six hundred eighty-seven thousand, nine hundred forty-nine".