3966655 has 16 divisors (see below), whose sum is σ = 5935104. Its totient is φ = 2472480.

The previous prime is 3966631. The next prime is 3966689. The reversal of 3966655 is 5566693.

It is not a de Polignac number, because 3966655 - 2⁵ = 3966623 is a prime.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4767 + ... + 5536.

It is an arithmetic number, because the mean of its divisors is an integer number (370944).

Almost surely, 2^3966655 is an apocalyptic number.

3966655 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

3966655 is a deficient number, since it is larger than the sum of its proper divisors (1968449).

3966655 is a wasteful number, since it uses less digits than its factorization.

3966655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10326.

The product of its digits is 145800, while the sum is 40.

The square root of 3966655 is about 1991.6463039405. The cubic root of 3966655 is about 158.2977747172.

The spelling of 3966655 in words is "three million, nine hundred sixty-six thousand, six hundred fifty-five".