16985729 has 4 divisors (see below), whose sum is σ = 17060784. Its totient is φ = 16910676.

The previous prime is 16985719. The next prime is 16985747. The reversal of 16985729 is 92758961.

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.

It is a cyclic number.

It is not a de Polignac number, because 16985729 - 2²⁴ = 208513 is a prime.

It is a super-2 number, since 2×16985729² = 577029979322882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16985719) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37187 + ... + 37640.

It is an arithmetic number, because the mean of its divisors is an integer number (4265196).

Almost surely, 2^16985729 is an apocalyptic number.

It is an amenable number.

16985729 is a deficient number, since it is larger than the sum of its proper divisors (75055).

16985729 is an equidigital number, since it uses as much as digits as its factorization.

16985729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75054.

The product of its digits is 272160, while the sum is 47.

The square root of 16985729 is about 4121.3746493130. The cubic root of 16985729 is about 257.0561884140.

The spelling of 16985729 in words is "sixteen million, nine hundred eighty-five thousand, seven hundred twenty-nine".