861265912 has 48 divisors (see below), whose sum is σ = 1824744240. Its totient is φ = 380210688.

The previous prime is 861265907. The next prime is 861265943. The reversal of 861265912 is 219562168.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17248 + ... + 44944.

It is an arithmetic number, because the mean of its divisors is an integer number (38015505).

Almost surely, 2^861265912 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 861265912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (912372120).

861265912 is an abundant number, since it is smaller than the sum of its proper divisors (963478328).

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

861265912 is a wasteful number, since it uses less digits than its factorization.

861265912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27752 (or 27735 counting only the distinct ones).

The product of its digits is 51840, while the sum is 40.

The square root of 861265912 is about 29347.3322808054. The cubic root of 861265912 is about 951.4349181620.

The spelling of 861265912 in words is "eight hundred sixty-one million, two hundred sixty-five thousand, nine hundred twelve".