3866691 has 8 divisors (see below), whose sum is σ = 5379840. Its totient is φ = 2465672.

The previous prime is 3866651. The next prime is 3866713. The reversal of 3866691 is 1966683.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3866691 - 2⁶ = 3866627 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3866651) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27951 + ... + 28088.

It is an arithmetic number, because the mean of its divisors is an integer number (672480).

Almost surely, 2^3866691 is an apocalyptic number.

3866691 is a deficient number, since it is larger than the sum of its proper divisors (1513149).

3866691 is a wasteful number, since it uses less digits than its factorization.

3866691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56065.

The product of its digits is 46656, while the sum is 39.

The square root of 3866691 is about 1966.3903478201. The cubic root of 3866691 is about 156.9566867685.

The spelling of 3866691 in words is "three million, eight hundred sixty-six thousand, six hundred ninety-one".