3866091 has 4 divisors (see below), whose sum is σ = 5154792. Its totient is φ = 2577392.

The previous prime is 3866081. The next prime is 3866099. The reversal of 3866091 is 1906683.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 3866091 - 2⁷ = 3865963 is a prime.

It is a D-number.

3866091 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (3866099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 644346 + ... + 644351.

It is an arithmetic number, because the mean of its divisors is an integer number (1288698).

Almost surely, 2^3866091 is an apocalyptic number.

3866091 is a deficient number, since it is larger than the sum of its proper divisors (1288701).

3866091 is a wasteful number, since it uses less digits than its factorization.

3866091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1288700.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 3866091 is about 1966.2377780930. The cubic root of 3866091 is about 156.9485679503.

The spelling of 3866091 in words is "three million, eight hundred sixty-six thousand, ninety-one".