3947656 has 8 divisors (see below), whose sum is σ = 7401870. Its totient is φ = 1973824.

The previous prime is 3947639. The next prime is 3947659. The reversal of 3947656 is 6567493.

It can be written as a sum of positive squares in only one way, i.e., 3006756 + 940900 = 1734^2 + 970^2 .

It is a tau number, because it is divible by the number of its divisors (8).

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 246721 + ... + 246736.

Almost surely, 2^3947656 is an apocalyptic number.

It is an amenable number.

3947656 is a deficient number, since it is larger than the sum of its proper divisors (3454214).

3947656 is a wasteful number, since it uses less digits than its factorization.

3947656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493463 (or 493459 counting only the distinct ones).

The product of its digits is 136080, while the sum is 40.

The square root of 3947656 is about 1986.8709067275. The cubic root of 3947656 is about 158.0446383516.

The spelling of 3947656 in words is "three million, nine hundred forty-seven thousand, six hundred fifty-six".