1225508620 has 36 divisors (see below), whose sum is σ = 2993744880. Its totient is φ = 420174048.

The previous prime is 1225508587. The next prime is 1225508629. The reversal of 1225508620 is 268055221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225508629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 624280 + ... + 626239.

It is an arithmetic number, because the mean of its divisors is an integer number (83159580).

Almost surely, 2^1225508620 is an apocalyptic number.

1225508620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1225508620 is an abundant number, since it is smaller than the sum of its proper divisors (1768236260).

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

1225508620 is a wasteful number, since it uses less digits than its factorization.

1225508620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1250542 (or 1250533 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 31.

The square root of 1225508620 is about 35007.2652459457. The cubic root of 1225508620 is about 1070.1355463420.

The spelling of 1225508620 in words is "one billion, two hundred twenty-five million, five hundred eight thousand, six hundred twenty".