1225520 has 20 divisors (see below), whose sum is σ = 2849520. Its totient is φ = 490176.

The previous prime is 1225517. The next prime is 1225529. The reversal of 1225520 is 255221.

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (1225529) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7580 + ... + 7739.

It is an arithmetic number, because the mean of its divisors is an integer number (142476).

2^1225520 is an apocalyptic number.

1225520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1225520 is an abundant number, since it is smaller than the sum of its proper divisors (1624000).

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

1225520 is a wasteful number, since it uses less digits than its factorization.

1225520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15332 (or 15326 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 17.

The square root of 1225520 is about 1107.0320681895. The cubic root of 1225520 is about 107.0138858737.

Subtracting from 1225520 its reverse (255221), we obtain a cube (970299 = 99³).

The spelling of 1225520 in words is "one million, two hundred twenty-five thousand, five hundred twenty".