1225305240 has 64 divisors (see below), whose sum is σ = 3678242400. Its totient is φ = 326541312.

The previous prime is 1225305227. The next prime is 1225305241. The reversal of 1225305240 is 425035221.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 1225305240.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225305241) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 328506 + ... + 332214.

Almost surely, 2^1225305240 is an apocalyptic number.

1225305240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1225305240 is an abundant number, since it is smaller than the sum of its proper divisors (2452937160).

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

1225305240 is a wasteful number, since it uses less digits than its factorization.

1225305240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6476 (or 6472 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 1225305240 is about 35004.3602998255. The cubic root of 1225305240 is about 1070.0763447434.

The spelling of 1225305240 in words is "one billion, two hundred twenty-five million, three hundred five thousand, two hundred forty".