1999999080 has 64 divisors (see below), whose sum is σ = 6666667200. Its totient is φ = 533332800.

The previous prime is 1999999061. The next prime is 1999999081. The reversal of 1999999080 is 809999991.

It is a junction number, because it is equal to n+sod(n) for n = 1999998999 and 1999999017.

It is not an unprimeable number, because it can be changed into a prime (1999999081) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 924846 + ... + 927005.

It is an arithmetic number, because the mean of its divisors is an integer number (104166675).

Almost surely, 2^1999999080 is an apocalyptic number.

1999999080 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1999999080 is an abundant number, since it is smaller than the sum of its proper divisors (4666668120).

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

1999999080 is a wasteful number, since it uses less digits than its factorization.

1999999080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1851871 (or 1851861 counting only the distinct ones).

The product of its (nonzero) digits is 4251528, while the sum is 63.

The square root of 1999999080 is about 44721.3492640819. The cubic root of 1999999080 is about 1259.9208567069.

The spelling of 1999999080 in words is "one billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, eighty".