1999800 has 144 divisors (see below), whose sum is σ = 7399080. Its totient is φ = 480000.

The previous prime is 1999799. The next prime is 1999817. The reversal of 1999800 is 89991.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 19750 + ... + 19850.

2^1999800 is an apocalyptic number.

1999800 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 1999800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3699540).

1999800 is an abundant number, since it is smaller than the sum of its proper divisors (5399280).

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

1999800 is a wasteful number, since it uses less digits than its factorization.

1999800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134 (or 122 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 36.

The square root of 1999800 is about 1414.1428499271. The cubic root of 1999800 is about 125.9879051127.

It can be divided in two parts, 199 and 9800, that added together give a palindrome (9999).

The spelling of 1999800 in words is "one million, nine hundred ninety-nine thousand, eight hundred".