1899450000 has 600 divisors, whose sum is σ = 7970364864. Its totient is φ = 427680000.

The previous prime is 1899449941. The next prime is 1899450029. The reversal of 1899450000 is 549981.

It is a tau number, because it is divible by the number of its divisors (600).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 28349967 + ... + 28350033.

Almost surely, 2^1899450000 is an apocalyptic number.

1899450000 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 1899450000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3985182432).

1899450000 is an abundant number, since it is smaller than the sum of its proper divisors (6070914864).

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

1899450000 is an frugal number, since it uses more digits than its factorization.

1899450000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119 (or 84 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 1899450000 is about 43582.6800460917. The cubic root of 1899450000 is about 1238.4428076964.

Adding to 1899450000 its reverse (549981), we get a palindrome (1899999981).

The spelling of 1899450000 in words is "one billion, eight hundred ninety-nine million, four hundred fifty thousand".