16005861 has 12 divisors (see below), whose sum is σ = 24125088. Its totient is φ = 10206504.

The previous prime is 16005859. The next prime is 16005863. The reversal of 16005861 is 16850061.

16005861 is a `hidden beast` number, since 1 + 600 + 58 + 6 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (16005859) and next prime (16005863).

It is not a de Polignac number, because 16005861 - 2¹ = 16005859 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16005863) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38455 + ... + 38868.

It is an arithmetic number, because the mean of its divisors is an integer number (2010424).

Almost surely, 2^16005861 is an apocalyptic number.

It is an amenable number.

16005861 is a deficient number, since it is larger than the sum of its proper divisors (8119227).

16005861 is a wasteful number, since it uses less digits than its factorization.

16005861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77352 (or 77349 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 16005861 is about 4000.7325579199. The cubic root of 16005861 is about 252.0149745448.

The spelling of 16005861 in words is "sixteen million, five thousand, eight hundred sixty-one".