3861872 has 60 divisors (see below), whose sum is σ = 9072336. Its totient is φ = 1559040.

The previous prime is 3861863. The next prime is 3861877. The reversal of 3861872 is 2781683.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3861877) 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 11 ways as a sum of consecutive naturals, for example, 94172 + ... + 94212.

Almost surely, 2^3861872 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 3861872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4536168).

3861872 is an abundant number, since it is smaller than the sum of its proper divisors (5210464).

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

3861872 is a wasteful number, since it uses less digits than its factorization.

3861872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114 (or 79 counting only the distinct ones).

The product of its digits is 16128, while the sum is 35.

The square root of 3861872 is about 1965.1646241473. The cubic root of 3861872 is about 156.8914553936.

The spelling of 3861872 in words is "three million, eight hundred sixty-one thousand, eight hundred seventy-two".