3855720 has 128 divisors (see below), whose sum is σ = 13271040. Its totient is φ = 887040.

The previous prime is 3855703. The next prime is 3855757. The reversal of 3855720 is 275583.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30297 + ... + 30423.

It is an arithmetic number, because the mean of its divisors is an integer number (103680).

Almost surely, 2^3855720 is an apocalyptic number.

3855720 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 3855720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6635520).

3855720 is an abundant number, since it is smaller than the sum of its proper divisors (9415320).

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

3855720 is a wasteful number, since it uses less digits than its factorization.

3855720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175 (or 171 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 3855720 is about 1963.5987370132. The cubic root of 3855720 is about 156.8081012405.

It can be divided in two parts, 385 and 5720, that added together give a triangular number (6105 = T₁₁₀).

The spelling of 3855720 in words is "three million, eight hundred fifty-five thousand, seven hundred twenty".