1225812240 has 120 divisors (see below), whose sum is σ = 4123986048. Its totient is φ = 326304000.

The previous prime is 1225812233. The next prime is 1225812271. The reversal of 1225812240 is 422185221.

1225812240 is a `hidden beast` number, since 1 + 22 + 581 + 22 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 539587 + ... + 541853.

Almost surely, 2^1225812240 is an apocalyptic number.

1225812240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1225812240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2061993024).

1225812240 is an abundant number, since it is smaller than the sum of its proper divisors (2898173808).

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

1225812240 is a wasteful number, since it uses less digits than its factorization.

1225812240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3037 (or 3028 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 27.

The square root of 1225812240 is about 35011.6015057866. The cubic root of 1225812240 is about 1070.2239144749.

Adding to 1225812240 its reverse (422185221), we get a palindrome (1647997461).

The spelling of 1225812240 in words is "one billion, two hundred twenty-five million, eight hundred twelve thousand, two hundred forty".