3861720 has 96 divisors (see below), whose sum is σ = 13309920. Its totient is φ = 967680.

The previous prime is 3861719. The next prime is 3861721. The reversal of 3861720 is 271683.

It is an interprime number because it is at equal distance from previous prime (3861719) and next prime (3861721).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3861721) 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, 5805 + ... + 6435.

It is an arithmetic number, because the mean of its divisors is an integer number (138645).

Almost surely, 2^3861720 is an apocalyptic number.

3861720 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3861720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6654960).

3861720 is an abundant number, since it is smaller than the sum of its proper divisors (9448200).

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

3861720 is a wasteful number, since it uses less digits than its factorization.

3861720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 665 (or 658 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 3861720 is about 1965.1259501620. The cubic root of 3861720 is about 156.8893969951.

The spelling of 3861720 in words is "three million, eight hundred sixty-one thousand, seven hundred twenty".