1225218 has 16 divisors (see below), whose sum is σ = 2517120. Its totient is φ = 397296.

The previous prime is 1225183. The next prime is 1225219. The reversal of 1225218 is 8125221.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1225194 and 1225203.

It is not an unprimeable number, because it can be changed into a prime (1225219) 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 7 ways as a sum of consecutive naturals, for example, 2538 + ... + 2981.

It is an arithmetic number, because the mean of its divisors is an integer number (157320).

2^1225218 is an apocalyptic number.

1225218 is an abundant number, since it is smaller than the sum of its proper divisors (1291902).

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

1225218 is a wasteful number, since it uses less digits than its factorization.

1225218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5561.

The product of its digits is 320, while the sum is 21.

The square root of 1225218 is about 1106.8956590393. The cubic root of 1225218 is about 107.0050948167.

The spelling of 1225218 in words is "one million, two hundred twenty-five thousand, two hundred eighteen".