861389130 has 96 divisors (see below), whose sum is σ = 2531511360. Its totient is φ = 186520320.

The previous prime is 861389101. The next prime is 861389147. The reversal of 861389130 is 31983168.

861389130 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 12510 + ... + 43350.

It is an arithmetic number, because the mean of its divisors is an integer number (26369910).

Almost surely, 2^861389130 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 861389130, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1265755680).

861389130 is an abundant number, since it is smaller than the sum of its proper divisors (1670122230).

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

861389130 is a wasteful number, since it uses less digits than its factorization.

861389130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30884 (or 30877 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 861389130 is about 29349.4315106784. The cubic root of 861389130 is about 951.4802887093.

The spelling of 861389130 in words is "eight hundred sixty-one million, three hundred eighty-nine thousand, one hundred thirty".