16808857 has 4 divisors (see below), whose sum is σ = 18101860. Its totient is φ = 15515856.

The previous prime is 16808833. The next prime is 16808881. The reversal of 16808857 is 75880861.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (16808833) and next prime (16808881).

It can be written as a sum of positive squares in 2 ways, for example, as 2247001 + 14561856 = 1499^2 + 3816^2 .

It is a cyclic number.

It is not a de Polignac number, because 16808857 - 2¹¹ = 16806809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16608857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 646482 + ... + 646507.

It is an arithmetic number, because the mean of its divisors is an integer number (4525465).

Almost surely, 2^16808857 is an apocalyptic number.

It is an amenable number.

16808857 is a deficient number, since it is larger than the sum of its proper divisors (1293003).

16808857 is a wasteful number, since it uses less digits than its factorization.

16808857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1293002.

The product of its (nonzero) digits is 107520, while the sum is 43.

The square root of 16808857 is about 4099.8606073865. The cubic root of 16808857 is about 256.1608333826.

The spelling of 16808857 in words is "sixteen million, eight hundred eight thousand, eight hundred fifty-seven".