2251800 has 120 divisors (see below), whose sum is σ = 7877100. Its totient is φ = 596160.

The previous prime is 2251771. The next prime is 2251807. The reversal of 2251800 is 81522.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2251807) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 16131 + ... + 16269.

2^2251800 is an apocalyptic number.

2251800 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 2251800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3938550).

2251800 is an abundant number, since it is smaller than the sum of its proper divisors (5625300).

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

2251800 is a wasteful number, since it uses less digits than its factorization.

2251800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167 (or 149 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 2251800 is about 1500.5998800480. The cubic root of 2251800 is about 131.0720036150.

It can be divided in two parts, 225 and 1800, that added together give a square (2025 = 45²).

The spelling of 2251800 in words is "two million, two hundred fifty-one thousand, eight hundred".