3021840 has 80 divisors (see below), whose sum is σ = 10416000. Its totient is φ = 805248.

The previous prime is 3021839. The next prime is 3021847. The reversal of 3021840 is 481203.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (3021847) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1461 + ... + 2859.

It is an arithmetic number, because the mean of its divisors is an integer number (130200).

Almost surely, 2^3021840 is an apocalyptic number.

3021840 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 3021840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5208000).

3021840 is an abundant number, since it is smaller than the sum of its proper divisors (7394160).

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

3021840 is a wasteful number, since it uses less digits than its factorization.

3021840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1421 (or 1409 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 3021840 is about 1738.3440395963. The cubic root of 3021840 is about 144.5740970457.

The spelling of 3021840 in words is "three million, twenty-one thousand, eight hundred forty".