1200200000 has 168 divisors, whose sum is σ = 3160907064. Its totient is φ = 450560000.

The previous prime is 1200199997. The next prime is 1200200021. The reversal of 1200200000 is 20021.

It can be written as a sum of positive squares in 12 ways, for example, as 1177313344 + 22886656 = 34312^2 + 4784^2 .

It is a Harshad number since it is a multiple of its sum of digits (5).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3399824 + ... + 3400176.

It is an arithmetic number, because the mean of its divisors is an integer number (18814923).

Almost surely, 2^1200200000 is an apocalyptic number.

1200200000 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 1200200000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1580453532).

1200200000 is an abundant number, since it is smaller than the sum of its proper divisors (1960707064).

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

1200200000 is an frugal number, since it uses more digits than its factorization.

1200200000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407 (or 377 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 5.

The square root of 1200200000 is about 34643.9027824522. The cubic root of 1200200000 is about 1062.7176024903.

Adding to 1200200000 its reverse (20021), we get a palindrome (1200220021).

The spelling of 1200200000 in words is "one billion, two hundred million, two hundred thousand".