16857993 has 8 divisors (see below), whose sum is σ = 22520608. Its totient is φ = 11217024.

The previous prime is 16857991. The next prime is 16858001. The reversal of 16857993 is 39975861.

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

It is not a de Polignac number, because 16857993 - 2¹ = 16857991 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16857991) 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, 3496 + ... + 6777.

It is an arithmetic number, because the mean of its divisors is an integer number (2815076).

Almost surely, 2^16857993 is an apocalyptic number.

It is an amenable number.

16857993 is a deficient number, since it is larger than the sum of its proper divisors (5662615).

16857993 is a wasteful number, since it uses less digits than its factorization.

16857993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10823.

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

The square root of 16857993 is about 4105.8486333522. The cubic root of 16857993 is about 256.4101954502.

The spelling of 16857993 in words is "sixteen million, eight hundred fifty-seven thousand, nine hundred ninety-three".