4005706 has 4 divisors (see below), whose sum is σ = 6008562. Its totient is φ = 2002852.

The previous prime is 4005691. The next prime is 4005733. The reversal of 4005706 is 6075004.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 2544025 + 1461681 = 1595^2 + 1209^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1001425 + ... + 1001428.

Almost surely, 2^4005706 is an apocalyptic number.

4005706 is a deficient number, since it is larger than the sum of its proper divisors (2002856).

4005706 is a wasteful number, since it uses less digits than its factorization.

4005706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2002855.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 4005706 is about 2001.4259916370. The cubic root of 4005706 is about 158.8155502541.

The spelling of 4005706 in words is "four million, five thousand, seven hundred six".