16860009 has 4 divisors (see below), whose sum is σ = 22480016. Its totient is φ = 11240004.

The previous prime is 16859993. The next prime is 16860013. The reversal of 16860009 is 90006861.

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 not a de Polignac number, because 16860009 - 2⁴ = 16859993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16860029) 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, 2809999 + ... + 2810004.

It is an arithmetic number, because the mean of its divisors is an integer number (5620004).

Almost surely, 2^16860009 is an apocalyptic number.

It is an amenable number.

16860009 is a deficient number, since it is larger than the sum of its proper divisors (5620007).

16860009 is an equidigital number, since it uses as much as digits as its factorization.

16860009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5620006.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 16860009 is about 4106.0941294617. The cubic root of 16860009 is about 256.4204161676.

The spelling of 16860009 in words is "sixteen million, eight hundred sixty thousand, nine".