1999870530 has 128 divisors (see below), whose sum is σ = 5643509760. Its totient is φ = 444034560.

The previous prime is 1999870529. The next prime is 1999870541. The reversal of 1999870530 is 350789991.

It is a happy number.

1999870530 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3090667 + ... + 3091313.

It is an arithmetic number, because the mean of its divisors is an integer number (44089920).

Almost surely, 2^1999870530 is an apocalyptic number.

1999870530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1999870530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2821754880).

1999870530 is an abundant number, since it is smaller than the sum of its proper divisors (3643639230).

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

1999870530 is a wasteful number, since it uses less digits than its factorization.

1999870530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1064.

The product of its (nonzero) digits is 612360, while the sum is 51.

The square root of 1999870530 is about 44719.9120079635. The cubic root of 1999870530 is about 1259.8938623118.

The spelling of 1999870530 in words is "one billion, nine hundred ninety-nine million, eight hundred seventy thousand, five hundred thirty".