1225800 has 96 divisors (see below), whose sum is σ = 4240800. Its totient is φ = 325440.

The previous prime is 1225787. The next prime is 1225817. The reversal of 1225800 is 85221.

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5287 + ... + 5513.

It is an arithmetic number, because the mean of its divisors is an integer number (44175).

2^1225800 is an apocalyptic number.

1225800 is a gapful number since it is divisible by the number (10) 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 1225800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2120400).

1225800 is an abundant number, since it is smaller than the sum of its proper divisors (3015000).

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

1225800 is a wasteful number, since it uses less digits than its factorization.

1225800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252 (or 237 counting only the distinct ones).

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

The square root of 1225800 is about 1107.1585252348. The cubic root of 1225800 is about 107.0220352324.

It can be divided in two parts, 1225 and 800, that added together give a square (2025 = 45²).

The spelling of 1225800 in words is "one million, two hundred twenty-five thousand, eight hundred".