1999997130 has 64 divisors (see below), whose sum is σ = 5102455680. Its totient is φ = 499974144.

The previous prime is 1999997117. The next prime is 1999997141. The reversal of 1999997130 is 317999991.

1999997130 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 31 ways as a sum of consecutive naturals, for example, 123441 + ... + 138699.

It is an arithmetic number, because the mean of its divisors is an integer number (79725870).

Almost surely, 2^1999997130 is an apocalyptic number.

1999997130 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 1999997130, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2551227840).

1999997130 is an abundant number, since it is smaller than the sum of its proper divisors (3102458550).

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

1999997130 is a wasteful number, since it uses less digits than its factorization.

1999997130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15543.

The product of its (nonzero) digits is 1240029, while the sum is 57.

The square root of 1999997130 is about 44721.3274624088. The cubic root of 1999997130 is about 1259.9204472323.

The spelling of 1999997130 in words is "one billion, nine hundred ninety-nine million, nine hundred ninety-seven thousand, one hundred thirty".