4005861 has 4 divisors (see below), whose sum is σ = 5341152. Its totient is φ = 2670572.

The previous prime is 4005847. The next prime is 4005889. The reversal of 4005861 is 1685004.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 4005861 - 2⁷ = 4005733 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4005821) 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, 667641 + ... + 667646.

It is an arithmetic number, because the mean of its divisors is an integer number (1335288).

Almost surely, 2^4005861 is an apocalyptic number.

It is an amenable number.

4005861 is a deficient number, since it is larger than the sum of its proper divisors (1335291).

4005861 is a wasteful number, since it uses less digits than its factorization.

4005861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1335290.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 4005861 is about 2001.4647136535. The cubic root of 4005861 is about 158.8175986731.

The spelling of 4005861 in words is "four million, five thousand, eight hundred sixty-one".