3991704806 has 4 divisors (see below), whose sum is σ = 5987557212. Its totient is φ = 1995852402.

The previous prime is 3991704803. The next prime is 3991704823. The reversal of 3991704806 is 6084071993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6084071993 = 6247 ⋅973919.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3991704803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 997926200 + ... + 997926203.

It is an arithmetic number, because the mean of its divisors is an integer number (1496889303).

Almost surely, 2^3991704806 is an apocalyptic number.

3991704806 is a deficient number, since it is larger than the sum of its proper divisors (1995852406).

3991704806 is a wasteful number, since it uses less digits than its factorization.

3991704806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1995852405.

The product of its (nonzero) digits is 326592, while the sum is 47.

The square root of 3991704806 is about 63179.9399018391. The cubic root of 3991704806 is about 1586.3029759150.

The spelling of 3991704806 in words is "three billion, nine hundred ninety-one million, seven hundred four thousand, eight hundred six".