1999080 has 80 divisors (see below), whose sum is σ = 6730020. Its totient is φ = 532224.

The previous prime is 1999069. The next prime is 1999099. The reversal of 1999080 is 809991.

It can be written as a sum of positive squares in 2 ways, for example, as 1726596 + 272484 = 1314^2 + 522^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2932 + ... + 3548.

2^1999080 is an apocalyptic number.

1999080 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 1999080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3365010).

1999080 is an abundant number, since it is smaller than the sum of its proper divisors (4730940).

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

1999080 is a wasteful number, since it uses less digits than its factorization.

1999080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640 (or 627 counting only the distinct ones).

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

The square root of 1999080 is about 1413.8882558392. Note that the first 3 decimals coincide. The cubic root of 1999080 is about 125.9727832371.

It can be divided in two parts, 19 and 99080, that added together give a palindrome (99099).

The spelling of 1999080 in words is "one million, nine hundred ninety-nine thousand, eighty".