3966649 has 16 divisors (see below), whose sum is σ = 4521600. Its totient is φ = 3459456.

The previous prime is 3966631. The next prime is 3966689. The reversal of 3966649 is 9466693.

It is a cyclic number.

It is not a de Polignac number, because 3966649 - 2⁵ = 3966617 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3966689) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12517 + ... + 12829.

It is an arithmetic number, because the mean of its divisors is an integer number (282600).

Almost surely, 2^3966649 is an apocalyptic number.

It is an amenable number.

3966649 is a deficient number, since it is larger than the sum of its proper divisors (554951).

3966649 is a wasteful number, since it uses less digits than its factorization.

3966649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384.

The product of its digits is 209952, while the sum is 43.

The square root of 3966649 is about 1991.6447976484. The cubic root of 3966649 is about 158.2976949029.

The spelling of 3966649 in words is "three million, nine hundred sixty-six thousand, six hundred forty-nine".