3855915 has 24 divisors (see below), whose sum is σ = 7639008. Its totient is φ = 1762560.

The previous prime is 3855913. The next prime is 3855919. The reversal of 3855915 is 5195583.

It is a happy number.

It is not a de Polignac number, because 3855915 - 2¹ = 3855913 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3855915.

It is not an unprimeable number, because it can be changed into a prime (3855913) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 5806 + ... + 6435.

It is an arithmetic number, because the mean of its divisors is an integer number (318292).

Almost surely, 2^3855915 is an apocalyptic number.

3855915 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

3855915 is a deficient number, since it is larger than the sum of its proper divisors (3783093).

3855915 is a wasteful number, since it uses less digits than its factorization.

3855915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12259 (or 12256 counting only the distinct ones).

The product of its digits is 27000, while the sum is 36.

The square root of 3855915 is about 1963.6483901147. The cubic root of 3855915 is about 156.8107446779.

The spelling of 3855915 in words is "three million, eight hundred fifty-five thousand, nine hundred fifteen".