16889861 has 4 divisors (see below), whose sum is σ = 17472300. Its totient is φ = 16307424.

The previous prime is 16889849. The next prime is 16889867. The reversal of 16889861 is 16898861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16898861 = 7 ⋅2414123.

It can be written as a sum of positive squares in 2 ways, for example, as 9572836 + 7317025 = 3094^2 + 2705^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16889861 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16889867) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 291176 + ... + 291233.

It is an arithmetic number, because the mean of its divisors is an integer number (4368075).

Almost surely, 2^16889861 is an apocalyptic number.

It is an amenable number.

16889861 is a deficient number, since it is larger than the sum of its proper divisors (582439).

16889861 is an equidigital number, since it uses as much as digits as its factorization.

16889861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 582438.

The product of its digits is 165888, while the sum is 47.

The square root of 16889861 is about 4109.7276065452. The cubic root of 16889861 is about 256.5716645837.

The spelling of 16889861 in words is "sixteen million, eight hundred eighty-nine thousand, eight hundred sixty-one".