1205550000 has 480 divisors, whose sum is σ = 4649702400. Its totient is φ = 298080000.

The previous prime is 1205549993. The next prime is 1205550013. The reversal of 1205550000 is 555021.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 25649977 + ... + 25650023.

It is an arithmetic number, because the mean of its divisors is an integer number (9686880).

Almost surely, 2^1205550000 is an apocalyptic number.

1205550000 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 1205550000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2324851200).

1205550000 is an abundant number, since it is smaller than the sum of its proper divisors (3444152400).

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

1205550000 is an equidigital number, since it uses as much as digits as its factorization.

1205550000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108 (or 76 counting only the distinct ones).

The product of its (nonzero) digits is 250, while the sum is 18.

The square root of 1205550000 is about 34721.0310906805. The cubic root of 1205550000 is about 1064.2943152874.

The spelling of 1205550000 in words is "one billion, two hundred five million, five hundred fifty thousand".