3947806 has 4 divisors (see below), whose sum is σ = 5921712. Its totient is φ = 1973902.

The previous prime is 3947771. The next prime is 3947807. The reversal of 3947806 is 6087493.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3947807) by changing a digit.

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, 986950 + ... + 986953.

It is an arithmetic number, because the mean of its divisors is an integer number (1480428).

Almost surely, 2^3947806 is an apocalyptic number.

3947806 is a deficient number, since it is larger than the sum of its proper divisors (1973906).

3947806 is a wasteful number, since it uses less digits than its factorization.

3947806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1973905.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 3947806 is about 1986.9086541661. The cubic root of 3947806 is about 158.0466400792.

It can be divided in two parts, 3947 and 806, that added together give a triangular number (4753 = T₉₇).

The spelling of 3947806 in words is "three million, nine hundred forty-seven thousand, eight hundred six".