1899609444 has 144 divisors (see below), whose sum is σ = 5283532800. Its totient is φ = 572866560.

The previous prime is 1899609421. The next prime is 1899609457. The reversal of 1899609444 is 4449069981.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4230532 + ... + 4230980.

It is an arithmetic number, because the mean of its divisors is an integer number (36691200).

Almost surely, 2^1899609444 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1899609444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2641766400).

1899609444 is an abundant number, since it is smaller than the sum of its proper divisors (3383923356).

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

1899609444 is a wasteful number, since it uses less digits than its factorization.

1899609444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 730 (or 725 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 54.

The square root of 1899609444 is about 43584.5092205935. The cubic root of 1899609444 is about 1238.4774592622.

The spelling of 1899609444 in words is "one billion, eight hundred ninety-nine million, six hundred nine thousand, four hundred forty-four".