1225343520 has 72 divisors (see below), whose sum is σ = 4181489676. Its totient is φ = 326757888.

The previous prime is 1225343513. The next prime is 1225343531. The reversal of 1225343520 is 253435221.

It is a happy number.

1225343520 is a `hidden beast` number, since 1 + 225 + 3 + 435 + 2 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1225280016 + 63504 = 35004^2 + 252^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 424027 + ... + 426906.

Almost surely, 2^1225343520 is an apocalyptic number.

1225343520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1225343520 is an abundant number, since it is smaller than the sum of its proper divisors (2956146156).

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

1225343520 is a wasteful number, since it uses less digits than its factorization.

1225343520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 850954 (or 850943 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The square root of 1225343520 is about 35004.9070845789. The cubic root of 1225343520 is about 1070.0874881152.

Adding to 1225343520 its reverse (253435221), we get a palindrome (1478778741).

The spelling of 1225343520 in words is "one billion, two hundred twenty-five million, three hundred forty-three thousand, five hundred twenty".