1800225 has 60 divisors (see below), whose sum is σ = 3841024. Its totient is φ = 816480.

The previous prime is 1800221. The next prime is 1800257. The reversal of 1800225 is 5220081.

It is not a de Polignac number, because 1800225 - 2² = 1800221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1800198 and 1800207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1800221) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 14112 + ... + 14238.

2^1800225 is an apocalyptic number.

1800225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1800225 is an abundant number, since it is smaller than the sum of its proper divisors (2040799).

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

1800225 is a wasteful number, since it uses less digits than its factorization.

1800225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156 (or 142 counting only the distinct ones).

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

The square root of 1800225 is about 1341.7246364288. The cubic root of 1800225 is about 121.6491082020.

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

The spelling of 1800225 in words is "one million, eight hundred thousand, two hundred twenty-five".