1225203640 has 16 divisors (see below), whose sum is σ = 2756708280. Its totient is φ = 490081440.

The previous prime is 1225203613. The next prime is 1225203641. The reversal of 1225203640 is 463025221.

It is a super-2 number, since 2×1225203640² = 3002247918938499200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225203641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15315006 + ... + 15315085.

Almost surely, 2^1225203640 is an apocalyptic number.

1225203640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1225203640 is an abundant number, since it is smaller than the sum of its proper divisors (1531504640).

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

1225203640 is a wasteful number, since it uses less digits than its factorization.

1225203640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30630102 (or 30630098 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 1225203640 is about 35002.9090219656. The cubic root of 1225203640 is about 1070.0467676883.

Adding to 1225203640 its reverse (463025221), we get a palindrome (1688228861).

The spelling of 1225203640 in words is "one billion, two hundred twenty-five million, two hundred three thousand, six hundred forty".