2251720 has 32 divisors (see below), whose sum is σ = 5193720. Its totient is φ = 878080.

The previous prime is 2251703. The next prime is 2251727. The reversal of 2251720 is 271522.

It can be written as a sum of positive squares in 4 ways, for example, as 1898884 + 352836 = 1378^2 + 594^2 .

It is not an unprimeable number, because it can be changed into a prime (2251727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 954 + ... + 2326.

2^2251720 is an apocalyptic number.

2251720 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 2251720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2596860).

2251720 is an abundant number, since it is smaller than the sum of its proper divisors (2942000).

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

2251720 is a wasteful number, since it uses less digits than its factorization.

2251720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1425 (or 1421 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 19.

The square root of 2251720 is about 1500.5732238048. The cubic root of 2251720 is about 131.0704513924.

The spelling of 2251720 in words is "two million, two hundred fifty-one thousand, seven hundred twenty".