1999800144 has 40 divisors (see below), whose sum is σ = 5740168320. Its totient is φ = 666599904.

The previous prime is 1999800139. The next prime is 1999800169. The reversal of 1999800144 is 4410089991.

It is a self number, because there is not a number n which added to its sum of digits gives 1999800144.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2314152 + ... + 2315015.

It is an arithmetic number, because the mean of its divisors is an integer number (143504208).

Almost surely, 2^1999800144 is an apocalyptic number.

It is an amenable number.

1999800144 is an abundant number, since it is smaller than the sum of its proper divisors (3740368176).

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

1999800144 is a wasteful number, since it uses less digits than its factorization.

1999800144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4629184 (or 4629172 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 45.

The square root of 1999800144 is about 44719.1250361632. The cubic root of 1999800144 is about 1259.8790813667.

The spelling of 1999800144 in words is "one billion, nine hundred ninety-nine million, eight hundred thousand, one hundred forty-four".