3866155 has 4 divisors (see below), whose sum is σ = 4639392. Its totient is φ = 3092920.

The previous prime is 3866147. The next prime is 3866171. The reversal of 3866155 is 5516683.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5516683 = 73 ⋅75571.

It is not a de Polignac number, because 3866155 - 2³ = 3866147 is a prime.

It is a Duffinian number.

It is a zygodrome in base 11.

It is a self number, because there is not a number n which added to its sum of digits gives 3866155.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 386611 + ... + 386620.

It is an arithmetic number, because the mean of its divisors is an integer number (1159848).

Almost surely, 2^3866155 is an apocalyptic number.

3866155 is a deficient number, since it is larger than the sum of its proper divisors (773237).

3866155 is an equidigital number, since it uses as much as digits as its factorization.

3866155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 773236.

The product of its digits is 21600, while the sum is 34.

The square root of 3866155 is about 1966.2540527612. The cubic root of 3866155 is about 156.9494339976.

The spelling of 3866155 in words is "three million, eight hundred sixty-six thousand, one hundred fifty-five".