3871855 has 8 divisors (see below), whose sum is σ = 5003712. Its totient is φ = 2859168.

The previous prime is 3871841. The next prime is 3871871. The reversal of 3871855 is 5581783.

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

It is not a de Polignac number, because 3871855 - 2⁵ = 3871823 is a prime.

It is a super-2 number, since 2×3871855² = 29982522282050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent 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, 29719 + ... + 29848.

It is an arithmetic number, because the mean of its divisors is an integer number (625464).

Almost surely, 2^3871855 is an apocalyptic number.

3871855 is a deficient number, since it is larger than the sum of its proper divisors (1131857).

3871855 is a wasteful number, since it uses less digits than its factorization.

3871855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59585.

The product of its digits is 33600, while the sum is 37.

The square root of 3871855 is about 1967.7029755530. The cubic root of 3871855 is about 157.0265280339.

The spelling of 3871855 in words is "three million, eight hundred seventy-one thousand, eight hundred fifty-five".