861954912 has 384 divisors, whose sum is σ = 3262694400. Its totient is φ = 214990848.

The previous prime is 861954911. The next prime is 861954937. The reversal of 861954912 is 219459168.

861954912 is a `hidden beast` number, since 86 + 19 + 549 + 12 = 666.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861954911) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1493568 + ... + 1494144.

It is an arithmetic number, because the mean of its divisors is an integer number (8496600).

Almost surely, 2^861954912 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 861954912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1631347200).

861954912 is an abundant number, since it is smaller than the sum of its proper divisors (2400739488).

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

861954912 is a wasteful number, since it uses less digits than its factorization.

861954912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 635 (or 621 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The square root of 861954912 is about 29359.0686500781. The cubic root of 861954912 is about 951.6885618277.

The spelling of 861954912 in words is "eight hundred sixty-one million, nine hundred fifty-four thousand, nine hundred twelve".