16857985 has 8 divisors (see below), whose sum is σ = 20347560. Its totient is φ = 13407744.

The previous prime is 16857983. The next prime is 16857991. The reversal of 16857985 is 58975861.

It can be written as a sum of positive squares in 4 ways, for example, as 913936 + 15944049 = 956^2 + 3993^2 .

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 16857985 - 2¹ = 16857983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16857983) 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, 8880 + ... + 10609.

It is an arithmetic number, because the mean of its divisors is an integer number (2543445).

Almost surely, 2^16857985 is an apocalyptic number.

It is an amenable number.

16857985 is a deficient number, since it is larger than the sum of its proper divisors (3489575).

16857985 is a wasteful number, since it uses less digits than its factorization.

16857985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19667.

The product of its digits is 604800, while the sum is 49.

The square root of 16857985 is about 4105.8476591320. The cubic root of 16857985 is about 256.4101548901.

The spelling of 16857985 in words is "sixteen million, eight hundred fifty-seven thousand, nine hundred eighty-five".