16857938 has 4 divisors (see below), whose sum is σ = 25286910. Its totient is φ = 8428968.

The previous prime is 16857923. The next prime is 16857947. The reversal of 16857938 is 83975861.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 13082689 + 3775249 = 3617^2 + 1943^2 .

It is a super-2 number, since 2×16857938² = 568380147223688, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 16857892 and 16857901.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4214483 + ... + 4214486.

Almost surely, 2^16857938 is an apocalyptic number.

16857938 is a deficient number, since it is larger than the sum of its proper divisors (8428972).

16857938 is an equidigital number, since it uses as much as digits as its factorization.

16857938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8428971.

The product of its digits is 362880, while the sum is 47.

The square root of 16857938 is about 4105.8419355840. The cubic root of 16857938 is about 256.4099165997.

The spelling of 16857938 in words is "sixteen million, eight hundred fifty-seven thousand, nine hundred thirty-eight".