3860820 has 72 divisors (see below), whose sum is σ = 11891880. Its totient is φ = 1013760.

The previous prime is 3860807. The next prime is 3860821. The reversal of 3860820 is 280683.

3860820 is a `hidden beast` number, since 38 + 608 + 20 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 311364 + 3549456 = 558^2 + 1884^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3860821) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15900 + ... + 16140.

It is an arithmetic number, because the mean of its divisors is an integer number (165165).

Almost surely, 2^3860820 is an apocalyptic number.

3860820 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 3860820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5945940).

3860820 is an abundant number, since it is smaller than the sum of its proper divisors (8031060).

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

3860820 is a wasteful number, since it uses less digits than its factorization.

3860820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345 (or 340 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 3860820 is about 1964.8969438625. The cubic root of 3860820 is about 156.8772080027.

The spelling of 3860820 in words is "three million, eight hundred sixty thousand, eight hundred twenty".