1228388500 has 48 divisors (see below), whose sum is σ = 2693068560. Its totient is φ = 489475200.

The previous prime is 1228388489. The next prime is 1228388501. The reversal of 1228388500 is 58838221.

It can be written as a sum of positive squares in 8 ways, for example, as 519657616 + 708730884 = 22796^2 + 26622^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1228388500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1228388501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 129934 + ... + 139066.

It is an arithmetic number, because the mean of its divisors is an integer number (56105595).

Almost surely, 2^1228388500 is an apocalyptic number.

1228388500 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 1228388500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1346534280).

1228388500 is an abundant number, since it is smaller than the sum of its proper divisors (1464680060).

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

1228388500 is a wasteful number, since it uses less digits than its factorization.

1228388500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9421 (or 9409 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 37.

The square root of 1228388500 is about 35048.3737140541. The cubic root of 1228388500 is about 1070.9731444307.

The spelling of 1228388500 in words is "one billion, two hundred twenty-eight million, three hundred eighty-eight thousand, five hundred".