3861918 has 40 divisors (see below), whose sum is σ = 8944320. Its totient is φ = 1244160.

The previous prime is 3861911. The next prime is 3861929. The reversal of 3861918 is 8191683.

3861918 is a `hidden beast` number, since 38 + 619 + 1 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3861911) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4638 + ... + 5406.

It is an arithmetic number, because the mean of its divisors is an integer number (223608).

Almost surely, 2^3861918 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3861918, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4472160).

3861918 is an abundant number, since it is smaller than the sum of its proper divisors (5082402).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3861918 is a wasteful number, since it uses less digits than its factorization.

3861918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 814 (or 805 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 3861918 is about 1965.1763279665. The cubic root of 3861918 is about 156.8920783193.

It can be divided in two parts, 386 and 1918, that added together give a square (2304 = 48²).

The spelling of 3861918 in words is "three million, eight hundred sixty-one thousand, nine hundred eighteen".