861791346 has 64 divisors (see below), whose sum is σ = 2118211200. Its totient is φ = 257992128.

The previous prime is 861791327. The next prime is 861791363. The reversal of 861791346 is 643197168.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9385 + ... + 42563.

It is an arithmetic number, because the mean of its divisors is an integer number (33097050).

Almost surely, 2^861791346 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 861791346, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1059105600).

861791346 is an abundant number, since it is smaller than the sum of its proper divisors (1256419854).

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

861791346 is a wasteful number, since it uses less digits than its factorization.

861791346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33240 (or 33234 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 861791346 is about 29356.2829050273. The cubic root of 861791346 is about 951.6283600173.

The spelling of 861791346 in words is "eight hundred sixty-one million, seven hundred ninety-one thousand, three hundred forty-six".