3861256 has 48 divisors (see below), whose sum is σ = 8778240. Its totient is φ = 1559520.

The previous prime is 3861251. The next prime is 3861259. The reversal of 3861256 is 6521683.

3861256 = T₃₄₃ + T₃₄₄ + ... + T₃₉₈.

3861256 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (3861251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20121 + ... + 20311.

It is an arithmetic number, because the mean of its divisors is an integer number (182880).

Almost surely, 2^3861256 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3861256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4389120).

3861256 is an abundant number, since it is smaller than the sum of its proper divisors (4916984).

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

3861256 is a wasteful number, since it uses less digits than its factorization.

3861256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242 (or 219 counting only the distinct ones).

The product of its digits is 8640, while the sum is 31.

The square root of 3861256 is about 1965.0078880249. The cubic root of 3861256 is about 156.8831131289.

Subtracting from 3861256 its sum of digits (31), we obtain a square (3861225 = 1965²).

The spelling of 3861256 in words is "three million, eight hundred sixty-one thousand, two hundred fifty-six".