2243988 has 36 divisors (see below), whose sum is σ = 5748288. Its totient is φ = 738000.

The previous prime is 2243987. The next prime is 2244091. The reversal of 2243988 is 8893422.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a d-powerful number, because it can be written as 2¹³ + 2¹⁷ + 4⁴ + 3⁵ + 9⁴ + 8³ + 8⁷ .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2243987) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2613 + ... + 3363.

2^2243988 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2243988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2874144).

2243988 is an abundant number, since it is smaller than the sum of its proper divisors (3504300).

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

2243988 is a wasteful number, since it uses less digits than its factorization.

2243988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 844 (or 839 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 2243988 is about 1497.9946595365. The cubic root of 2243988 is about 130.9202552558.

The spelling of 2243988 in words is "two million, two hundred forty-three thousand, nine hundred eighty-eight".