1999913544 has 128 divisors (see below), whose sum is σ = 5870016000. Its totient is φ = 629862912.

The previous prime is 1999913537. The next prime is 1999913551. The reversal of 1999913544 is 4453199991.

It is a happy number.

1999913544 is a `hidden beast` number, since 1 + 9 + 9 + 9 + 91 + 3 + 544 = 666.

It is an interprime number because it is at equal distance from previous prime (1999913537) and next prime (1999913551).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 291012 + ... + 297804.

It is an arithmetic number, because the mean of its divisors is an integer number (45859500).

Almost surely, 2^1999913544 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 1999913544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2935008000).

1999913544 is an abundant number, since it is smaller than the sum of its proper divisors (3870102456).

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

1999913544 is a wasteful number, since it uses less digits than its factorization.

1999913544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6884 (or 6874 counting only the distinct ones).

The product of its digits is 1574640, while the sum is 54.

The square root of 1999913544 is about 44720.3929320841. The cubic root of 1999913544 is about 1259.9028950109.

The spelling of 1999913544 in words is "one billion, nine hundred ninety-nine million, nine hundred thirteen thousand, five hundred forty-four".