2221940 has 48 divisors (see below), whose sum is σ = 5443200. Its totient is φ = 746112.

The previous prime is 2221931. The next prime is 2221943. The reversal of 2221940 is 491222.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221943) 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, 8126 + ... + 8394.

It is an arithmetic number, because the mean of its divisors is an integer number (113400).

2^2221940 is an apocalyptic number.

2221940 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 2221940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2721600).

2221940 is an abundant number, since it is smaller than the sum of its proper divisors (3221260).

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

2221940 is a wasteful number, since it uses less digits than its factorization.

2221940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344 (or 342 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 2221940 is about 1490.6173217832. The cubic root of 2221940 is about 130.4900634919.

The spelling of 2221940 in words is "two million, two hundred twenty-one thousand, nine hundred forty".