3871620 has 72 divisors (see below), whose sum is σ = 11904984. Its totient is φ = 1018368.

The previous prime is 3871619. The next prime is 3871657. The reversal of 3871620 is 261783.

3871620 is a `hidden beast` number, since 38 + 7 + 1 + 620 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 254016 + 3617604 = 504^2 + 1902^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24582 + ... + 24738.

It is an arithmetic number, because the mean of its divisors is an integer number (165347).

Almost surely, 2^3871620 is an apocalyptic number.

3871620 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 3871620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5952492).

3871620 is an abundant number, since it is smaller than the sum of its proper divisors (8033364).

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

3871620 is a wasteful number, since it uses less digits than its factorization.

3871620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309 (or 304 counting only the distinct ones).

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

The square root of 3871620 is about 1967.6432603498. The cubic root of 3871620 is about 157.0233510915.

The spelling of 3871620 in words is "three million, eight hundred seventy-one thousand, six hundred twenty".