2220840 has 96 divisors (see below), whose sum is σ = 7488000. Its totient is φ = 570240.

The previous prime is 2220839. The next prime is 2220887. The reversal of 2220840 is 480222.

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

It is a congruent number.

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, 11061 + ... + 11259.

It is an arithmetic number, because the mean of its divisors is an integer number (78000).

2^2220840 is an apocalyptic number.

2220840 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 2220840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3744000).

2220840 is an abundant number, since it is smaller than the sum of its proper divisors (5267160).

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

2220840 is a wasteful number, since it uses less digits than its factorization.

2220840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247 (or 240 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 2220840 is about 1490.2483014585. The cubic root of 2220840 is about 130.4685263421.

The spelling of 2220840 in words is "two million, two hundred twenty thousand, eight hundred forty".