16857919 has 12 divisors (see below), whose sum is σ = 19052496. Its totient is φ = 14881152.

The previous prime is 16857917. The next prime is 16857923. The reversal of 16857919 is 91975861.

It is a happy number.

It is not a de Polignac number, because 16857919 - 2¹ = 16857917 is a prime.

It is a super-2 number, since 2×16857919² = 568378866021122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16857917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1719 + ... + 6055.

It is an arithmetic number, because the mean of its divisors is an integer number (1587708).

Almost surely, 2^16857919 is an apocalyptic number.

16857919 is a deficient number, since it is larger than the sum of its proper divisors (2194577).

16857919 is a wasteful number, since it uses less digits than its factorization.

16857919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4386 (or 4373 counting only the distinct ones).

The product of its digits is 136080, while the sum is 46.

The square root of 16857919 is about 4105.8396218070. The cubic root of 16857919 is about 256.4098202694.

It can be divided in two parts, 1685 and 7919, that added together give a square (9604 = 98²).

The spelling of 16857919 in words is "sixteen million, eight hundred fifty-seven thousand, nine hundred nineteen".