3855815 has 4 divisors (see below), whose sum is σ = 4626984. Its totient is φ = 3084648.

The previous prime is 3855799. The next prime is 3855829. The reversal of 3855815 is 5185583.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 3855815 - 2⁴ = 3855799 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

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, 385577 + ... + 385586.

It is an arithmetic number, because the mean of its divisors is an integer number (1156746).

Almost surely, 2^3855815 is an apocalyptic number.

3855815 is a deficient number, since it is larger than the sum of its proper divisors (771169).

3855815 is an equidigital number, since it uses as much as digits as its factorization.

3855815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 771168.

The product of its digits is 24000, while the sum is 35.

The square root of 3855815 is about 1963.6229271426. The cubic root of 3855815 is about 156.8093890801.

The spelling of 3855815 in words is "three million, eight hundred fifty-five thousand, eight hundred fifteen".