1225244840 has 16 divisors (see below), whose sum is σ = 2756800980. Its totient is φ = 490097920.

The previous prime is 1225244807. The next prime is 1225244863. The reversal of 1225244840 is 484425221.

It can be written as a sum of positive squares in 2 ways, for example, as 1220943364 + 4301476 = 34942^2 + 2074^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1225244797 and 1225244806.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15315521 + ... + 15315600.

Almost surely, 2^1225244840 is an apocalyptic number.

1225244840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1225244840 is an abundant number, since it is smaller than the sum of its proper divisors (1531556140).

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

1225244840 is a wasteful number, since it uses less digits than its factorization.

1225244840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30631132 (or 30631128 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 32.

The square root of 1225244840 is about 35003.4975395317. The cubic root of 1225244840 is about 1070.0587617305.

The spelling of 1225244840 in words is "one billion, two hundred twenty-five million, two hundred forty-four thousand, eight hundred forty".