1225220 has 12 divisors (see below), whose sum is σ = 2573004. Its totient is φ = 490080.

The previous prime is 1225219. The next prime is 1225223. The reversal of 1225220 is 225221.

It can be written as a sum of positive squares in 2 ways, for example, as 334084 + 891136 = 578^2 + 944^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1225195 and 1225204.

It is not an unprimeable number, because it can be changed into a prime (1225223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30611 + ... + 30650.

It is an arithmetic number, because the mean of its divisors is an integer number (214417).

2^1225220 is an apocalyptic number.

1225220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1225220 is an abundant number, since it is smaller than the sum of its proper divisors (1347784).

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

1225220 is a wasteful number, since it uses less digits than its factorization.

1225220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61270 (or 61268 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 1225220 is about 1106.8965624664. The cubic root of 1225220 is about 107.0051530403.

Subtracting from 1225220 its reverse (225221), we obtain a palindrome (999999).

The spelling of 1225220 in words is "one million, two hundred twenty-five thousand, two hundred twenty".