3865985 has 8 divisors (see below), whose sum is σ = 4738176. Its totient is φ = 3026800.

The previous prime is 3865969. The next prime is 3865991. The reversal of 3865985 is 5895683.

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

It is not a de Polignac number, because 3865985 - 2⁴ = 3865969 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7991 + ... + 8460.

It is an arithmetic number, because the mean of its divisors is an integer number (592272).

Almost surely, 2^3865985 is an apocalyptic number.

It is an amenable number.

3865985 is a deficient number, since it is larger than the sum of its proper divisors (872191).

3865985 is a wasteful number, since it uses less digits than its factorization.

3865985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16503.

The product of its digits is 259200, while the sum is 44.

The square root of 3865985 is about 1966.2108228773. The cubic root of 3865985 is about 156.9471335384.

The spelling of 3865985 in words is "three million, eight hundred sixty-five thousand, nine hundred eighty-five".