1999009152 has 256 divisors, whose sum is σ = 7099200000. Its totient is φ = 540960768.

The previous prime is 1999009087. The next prime is 1999009163. The reversal of 1999009152 is 2519009991.

It is a junction number, because it is equal to n+sod(n) for n = 1999009098 and 1999009107.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 457474 + ... + 461822.

It is an arithmetic number, because the mean of its divisors is an integer number (27731250).

Almost surely, 2^1999009152 is an apocalyptic number.

1999009152 is a gapful number since it is divisible by the number (12) 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 1999009152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3549600000).

1999009152 is an abundant number, since it is smaller than the sum of its proper divisors (5100190848).

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

1999009152 is a wasteful number, since it uses less digits than its factorization.

1999009152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4398 (or 4380 counting only the distinct ones).

The product of its (nonzero) digits is 65610, while the sum is 45.

The square root of 1999009152 is about 44710.2801601600. The cubic root of 1999009152 is about 1259.7129504832.

The spelling of 1999009152 in words is "one billion, nine hundred ninety-nine million, nine thousand, one hundred fifty-two".