3966784 has 14 divisors (see below), whose sum is σ = 7871714. Its totient is φ = 1983360.

The previous prime is 3966779. The next prime is 3966799. The reversal of 3966784 is 4876693.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 3504384 + 462400 = 1872^2 + 680^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 3966784.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30927 + ... + 31054.

Almost surely, 2^3966784 is an apocalyptic number.

It is an amenable number.

3966784 is a deficient number, since it is larger than the sum of its proper divisors (3904930).

3966784 is an equidigital number, since it uses as much as digits as its factorization.

3966784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61993 (or 61983 counting only the distinct ones).

The product of its digits is 217728, while the sum is 43.

The square root of 3966784 is about 1991.6786889456. The cubic root of 3966784 is about 158.2994907047.

Subtracting 3966784 from its reverse (4876693), we obtain a palindrome (909909).

The spelling of 3966784 in words is "three million, nine hundred sixty-six thousand, seven hundred eighty-four".