1205500000 has 84 divisors (see below), whose sum is σ = 2967852636. Its totient is φ = 482000000.

The previous prime is 1205499991. The next prime is 1205500003. The reversal of 1205500000 is 55021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1205500003) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 498795 + ... + 501205.

It is an arithmetic number, because the mean of its divisors is an integer number (35331579).

Almost surely, 2^1205500000 is an apocalyptic number.

1205500000 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 1205500000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1483926318).

1205500000 is an abundant number, since it is smaller than the sum of its proper divisors (1762352636).

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

1205500000 is an frugal number, since it uses more digits than its factorization.

1205500000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2451 (or 2418 counting only the distinct ones).

The product of its (nonzero) digits is 50, while the sum is 13.

The square root of 1205500000 is about 34720.3110585144. The cubic root of 1205500000 is about 1064.2796012698.

Adding to 1205500000 its reverse (55021), we get a palindrome (1205555021).

The spelling of 1205500000 in words is "one billion, two hundred five million, five hundred thousand".