3866865 has 8 divisors (see below), whose sum is σ = 6187008. Its totient is φ = 2062320.

The previous prime is 3866857. The next prime is 3866867. The reversal of 3866865 is 5686683.

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

It is not a de Polignac number, because 3866865 - 2³ = 3866857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3866867) 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, 128881 + ... + 128910.

It is an arithmetic number, because the mean of its divisors is an integer number (773376).

Almost surely, 2^3866865 is an apocalyptic number.

It is an amenable number.

3866865 is a deficient number, since it is larger than the sum of its proper divisors (2320143).

3866865 is a wasteful number, since it uses less digits than its factorization.

3866865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257799.

The product of its digits is 207360, while the sum is 42.

The square root of 3866865 is about 1966.4345908268. The cubic root of 3866865 is about 156.9590410686.

The spelling of 3866865 in words is "three million, eight hundred sixty-six thousand, eight hundred sixty-five".