2231988 has 48 divisors (see below), whose sum is σ = 5847744. Its totient is φ = 656640.

The previous prime is 2231941. The next prime is 2232017. The reversal of 2231988 is 8891322.

2231988 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×2231988³ = 33357755469900666816, which contains 333 as substring.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

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, 4656 + ... + 5112.

It is an arithmetic number, because the mean of its divisors is an integer number (121828).

2^2231988 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 2231988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2923872).

2231988 is an abundant number, since it is smaller than the sum of its proper divisors (3615756).

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

2231988 is a wasteful number, since it uses less digits than its factorization.

2231988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 512 (or 510 counting only the distinct ones).

The product of its digits is 6912, while the sum is 33.

The square root of 2231988 is about 1493.9839356566. The cubic root of 2231988 is about 130.6864673358.

It can be divided in two parts, 223 and 1988, that added together give a triangular number (2211 = T₆₆).

The spelling of 2231988 in words is "two million, two hundred thirty-one thousand, nine hundred eighty-eight".