16486809 has 4 divisors (see below), whose sum is σ = 21982416. Its totient is φ = 10991204.

The previous prime is 16486777. The next prime is 16486829. The reversal of 16486809 is 90868461.

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, and also an emirpimes, since its reverse is a distinct semiprime: 90868461 = 3 ⋅30289487.

It is a cyclic number.

It is not a de Polignac number, because 16486809 - 2⁵ = 16486777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16486829) 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, 2747799 + ... + 2747804.

It is an arithmetic number, because the mean of its divisors is an integer number (5495604).

Almost surely, 2^16486809 is an apocalyptic number.

It is an amenable number.

16486809 is a deficient number, since it is larger than the sum of its proper divisors (5495607).

16486809 is an equidigital number, since it uses as much as digits as its factorization.

16486809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5495606.

The product of its (nonzero) digits is 82944, while the sum is 42.

The square root of 16486809 is about 4060.3951778121. The cubic root of 16486809 is about 254.5143081054.

The spelling of 16486809 in words is "sixteen million, four hundred eighty-six thousand, eight hundred nine".