16851845 has 8 divisors (see below), whose sum is σ = 21411864. Its totient is φ = 12688384.

The previous prime is 16851833. The next prime is 16851859. The reversal of 16851845 is 54815861.

It can be written as a sum of positive squares in 4 ways, for example, as 3265249 + 13586596 = 1807^2 + 3686^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 16851845 - 2⁶ = 16851781 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16851799 and 16851808.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99044 + ... + 99213.

It is an arithmetic number, because the mean of its divisors is an integer number (2676483).

Almost surely, 2^16851845 is an apocalyptic number.

It is an amenable number.

16851845 is a deficient number, since it is larger than the sum of its proper divisors (4560019).

16851845 is a wasteful number, since it uses less digits than its factorization.

16851845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198279.

The product of its digits is 38400, while the sum is 38.

The square root of 16851845 is about 4105.0998769823. The cubic root of 16851845 is about 256.3790212854.

The spelling of 16851845 in words is "sixteen million, eight hundred fifty-one thousand, eight hundred forty-five".