16857243 has 18 divisors (see below), whose sum is σ = 26368836. Its totient is φ = 10372752.

The previous prime is 16857209. The next prime is 16857259. The reversal of 16857243 is 34275861.

It is not a de Polignac number, because 16857243 - 2⁶ = 16857179 is a prime.

It is a super-2 number, since 2×16857243² = 568333283122098, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 16857198 and 16857207.

It is not an unprimeable number, because it can be changed into a prime (16857263) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4021 + ... + 7062.

Almost surely, 2^16857243 is an apocalyptic number.

16857243 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

16857243 is a deficient number, since it is larger than the sum of its proper divisors (9511593).

16857243 is a wasteful number, since it uses less digits than its factorization.

16857243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11115 (or 11099 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 16857243 is about 4105.7572992080. The cubic root of 16857243 is about 256.4063928920.

The spelling of 16857243 in words is "sixteen million, eight hundred fifty-seven thousand, two hundred forty-three".