2251320 has 64 divisors (see below), whose sum is σ = 6873120. Its totient is φ = 589824.

The previous prime is 2251297. The next prime is 2251331. The reversal of 2251320 is 231522.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 2251320.

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, 8632 + ... + 8888.

2^2251320 is an apocalyptic number.

2251320 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 2251320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3436560).

2251320 is an abundant number, since it is smaller than the sum of its proper divisors (4621800).

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

2251320 is a wasteful number, since it uses less digits than its factorization.

2251320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344 (or 340 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 2251320 is about 1500.4399354856. The cubic root of 2251320 is about 131.0626897279.

Adding to 2251320 its reverse (231522), we get a palindrome (2482842).

The spelling of 2251320 in words is "two million, two hundred fifty-one thousand, three hundred twenty".