2861220 has 48 divisors (see below), whose sum is σ = 8205120. Its totient is φ = 744576.

The previous prime is 2861213. The next prime is 2861231. The reversal of 2861220 is 221682.

2861220 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2026 + ... + 3134.

It is an arithmetic number, because the mean of its divisors is an integer number (170940).

2^2861220 is an apocalyptic number.

2861220 is a gapful number since it is divisible by the number (20) 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 2861220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4102560).

2861220 is an abundant number, since it is smaller than the sum of its proper divisors (5343900).

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

2861220 is a wasteful number, since it uses less digits than its factorization.

2861220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1164 (or 1162 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 2861220 is about 1691.5141146322. The cubic root of 2861220 is about 141.9658054277.

It can be divided in two parts, 2861 and 220, that added together give a triangular number (3081 = T₇₈).

The spelling of 2861220 in words is "two million, eight hundred sixty-one thousand, two hundred twenty".