3947658 has 64 divisors (see below), whose sum is σ = 9580032. Its totient is φ = 1068480.

The previous prime is 3947639. The next prime is 3947659. The reversal of 3947658 is 8567493.

It is a happy number.

3947658 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a d-powerful number, because it can be written as 3¹³ + 9⁵ + 4³ + 7⁶ + 6⁴ + 5⁷ + 8⁷ .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3947659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 36841 + ... + 36947.

It is an arithmetic number, because the mean of its divisors is an integer number (149688).

Almost surely, 2^3947658 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3947658, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4790016).

3947658 is an abundant number, since it is smaller than the sum of its proper divisors (5632374).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3947658 is a wasteful number, since it uses less digits than its factorization.

3947658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179.

The product of its digits is 181440, while the sum is 42.

The square root of 3947658 is about 1986.8714100314. The cubic root of 3947658 is about 158.0446650416.

The spelling of 3947658 in words is "three million, nine hundred forty-seven thousand, six hundred fifty-eight".