1225320 has 32 divisors (see below), whose sum is σ = 3676320. Its totient is φ = 326720.

The previous prime is 1225319. The next prime is 1225327. The reversal of 1225320 is 235221.

It is a hoax number, since the sum of its digits (15) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1225320.

It is not an unprimeable number, because it can be changed into a prime (1225327) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4986 + ... + 5225.

It is an arithmetic number, because the mean of its divisors is an integer number (114885).

2^1225320 is an apocalyptic number.

1225320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1225320 is an abundant number, since it is smaller than the sum of its proper divisors (2451000).

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

1225320 is a wasteful number, since it uses less digits than its factorization.

1225320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10225 (or 10221 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 1225320 is about 1106.9417328839. The cubic root of 1225320 is about 107.0080641431.

Subtracting from 1225320 its reverse (235221), we obtain a palindrome (990099).

The spelling of 1225320 in words is "one million, two hundred twenty-five thousand, three hundred twenty".