16857939 has 8 divisors (see below), whose sum is σ = 25688320. Its totient is φ = 9633096.

The previous prime is 16857923. The next prime is 16857947. The reversal of 16857939 is 93975861.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16857939 - 2⁴ = 16857923 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16857979) 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 7 ways as a sum of consecutive naturals, for example, 401359 + ... + 401400.

It is an arithmetic number, because the mean of its divisors is an integer number (3211040).

Almost surely, 2^16857939 is an apocalyptic number.

16857939 is a deficient number, since it is larger than the sum of its proper divisors (8830381).

16857939 is an equidigital number, since it uses as much as digits as its factorization.

16857939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 802769.

The product of its digits is 408240, while the sum is 48.

The square root of 16857939 is about 4105.8420573617. The cubic root of 16857939 is about 256.4099216697.

The spelling of 16857939 in words is "sixteen million, eight hundred fifty-seven thousand, nine hundred thirty-nine".