2221780 has 24 divisors (see below), whose sum is σ = 5090400. Its totient is φ = 807840.

The previous prime is 2221771. The next prime is 2221789. The reversal of 2221780 is 871222.

2221780 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (2221771) and next prime (2221789).

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4830 + ... + 5269.

It is an arithmetic number, because the mean of its divisors is an integer number (212100).

2^2221780 is an apocalyptic number.

2221780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2221780 is an abundant number, since it is smaller than the sum of its proper divisors (2868620).

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

2221780 is a wasteful number, since it uses less digits than its factorization.

2221780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10119 (or 10117 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 2221780 is about 1490.5636517774. The cubic root of 2221780 is about 130.4869312574.

It can be divided in two parts, 222 and 1780, that added together give a palindrome (2002).

The spelling of 2221780 in words is "two million, two hundred twenty-one thousand, seven hundred eighty".