3821580 has 120 divisors (see below), whose sum is σ = 13741728. Its totient is φ = 870912.

The previous prime is 3821579. The next prime is 3821581. The reversal of 3821580 is 851283.

It is a happy number.

3821580 is a `hidden beast` number, since 3 + 82 + 1 + 580 = 666.

It is an interprime number because it is at equal distance from previous prime (3821579) and next prime (3821581).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (3821581) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 11172 + ... + 11508.

Almost surely, 2^3821580 is an apocalyptic number.

3821580 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 3821580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6870864).

3821580 is an abundant number, since it is smaller than the sum of its proper divisors (9920148).

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

3821580 is a wasteful number, since it uses less digits than its factorization.

3821580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365 (or 354 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 3821580 is about 1954.8861859454. The cubic root of 3821580 is about 156.3439158062.

The spelling of 3821580 in words is "three million, eight hundred twenty-one thousand, five hundred eighty".