3869985 has 16 divisors (see below), whose sum is σ = 7076736. Its totient is φ = 1769088.

The previous prime is 3869959. The next prime is 3869989. The reversal of 3869985 is 5899683.

It is not a de Polignac number, because 3869985 - 2⁷ = 3869857 is a prime.

It is an Ulam number.

3869985 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (3869989) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18324 + ... + 18533.

It is an arithmetic number, because the mean of its divisors is an integer number (442296).

Almost surely, 2^3869985 is an apocalyptic number.

3869985 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

3869985 is a deficient number, since it is larger than the sum of its proper divisors (3206751).

3869985 is a wasteful number, since it uses less digits than its factorization.

3869985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36872.

The product of its digits is 466560, while the sum is 48.

The square root of 3869985 is about 1967.2277448226. The cubic root of 3869985 is about 157.0012441245.

The spelling of 3869985 in words is "three million, eight hundred sixty-nine thousand, nine hundred eighty-five".