1999100100 has 144 divisors (see below), whose sum is σ = 6110720000. Its totient is φ = 503798400.

The previous prime is 1999100011. The next prime is 1999100101. The reversal of 1999100100 is 10019991.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (1999100101) by changing a digit.

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, 397401 + ... + 402399.

Almost surely, 2^1999100100 is an apocalyptic number.

1999100100 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 1999100100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3055360000).

1999100100 is an abundant number, since it is smaller than the sum of its proper divisors (4111619900).

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

1999100100 is a wasteful number, since it uses less digits than its factorization.

1999100100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5090 (or 5083 counting only the distinct ones).

The product of its (nonzero) digits is 729, while the sum is 30.

The square root of 1999100100 is about 44711.2972301185. The cubic root of 1999100100 is about 1259.7320543871.

The spelling of 1999100100 in words is "one billion, nine hundred ninety-nine million, one hundred thousand, one hundred".