1225005320 has 64 divisors (see below), whose sum is σ = 3436387200. Its totient is φ = 381818880.

The previous prime is 1225005319. The next prime is 1225005343. The reversal of 1225005320 is 235005221.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1225005292 and 1225005301.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 195785 + ... + 201944.

It is an arithmetic number, because the mean of its divisors is an integer number (53693550).

Almost surely, 2^1225005320 is an apocalyptic number.

1225005320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1225005320 is an abundant number, since it is smaller than the sum of its proper divisors (2211381880).

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

1225005320 is a wasteful number, since it uses less digits than its factorization.

1225005320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397758 (or 397754 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 1225005320 is about 35000.0759999175. The cubic root of 1225005320 is about 1069.9890294971.

Subtracting from 1225005320 its reverse (235005221), we obtain a palindrome (990000099).

The spelling of 1225005320 in words is "one billion, two hundred twenty-five million, five thousand, three hundred twenty".