2231320 has 64 divisors (see below), whose sum is σ = 6189120. Its totient is φ = 705024.

The previous prime is 2231311. The next prime is 2231329. The reversal of 2231320 is 231322.

It is a happy number.

2231320 is nontrivially palindromic in base 9.

It is an interprime number because it is at equal distance from previous prime (2231311) and next prime (2231329).

It is a super-3 number, since 3×2231320³ = 33327814028867904000, which contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a self number, because there is not a number n which added to its sum of digits gives 2231320.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2231329) 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, 3334 + ... + 3946.

It is an arithmetic number, because the mean of its divisors is an integer number (96705).

2^2231320 is an apocalyptic number.

2231320 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 2231320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3094560).

2231320 is an abundant number, since it is smaller than the sum of its proper divisors (3957800).

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

2231320 is a wasteful number, since it uses less digits than its factorization.

2231320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 644 (or 640 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 2231320 is about 1493.7603556126. The cubic root of 2231320 is about 130.6734285454.

Adding to 2231320 its reverse (231322), we get a palindrome (2462642).

The spelling of 2231320 in words is "two million, two hundred thirty-one thousand, three hundred twenty".