16859861 has 8 divisors (see below), whose sum is σ = 17274264. Its totient is φ = 16450560.

The previous prime is 16859849. The next prime is 16859863. The reversal of 16859861 is 16895861.

It can be written as a sum of positive squares in 4 ways, for example, as 8836 + 16851025 = 94^2 + 4105^2 .

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 16859861 - 2¹⁸ = 16597717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16859863) 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, 5891 + ... + 8271.

It is an arithmetic number, because the mean of its divisors is an integer number (2159283).

Almost surely, 2^16859861 is an apocalyptic number.

It is an amenable number.

16859861 is a deficient number, since it is larger than the sum of its proper divisors (414403).

16859861 is an equidigital number, since it uses as much as digits as its factorization.

16859861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2551.

The product of its digits is 103680, while the sum is 44.

The square root of 16859861 is about 4106.0761074291. The cubic root of 16859861 is about 256.4196658649.

The spelling of 16859861 in words is "sixteen million, eight hundred fifty-nine thousand, eight hundred sixty-one".