861229086 has 32 divisors (see below), whose sum is σ = 1746869760. Its totient is φ = 283018944.

The previous prime is 861229079. The next prime is 861229097. The reversal of 861229086 is 680922168.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 564721 + ... + 566243.

It is an arithmetic number, because the mean of its divisors is an integer number (54589680).

Almost surely, 2^861229086 is an apocalyptic number.

861229086 is an abundant number, since it is smaller than the sum of its proper divisors (885640674).

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

861229086 is a wasteful number, since it uses less digits than its factorization.

861229086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2800.

The product of its (nonzero) digits is 82944, while the sum is 42.

The square root of 861229086 is about 29346.7048576156. The cubic root of 861229086 is about 951.4213574869.

The spelling of 861229086 in words is "eight hundred sixty-one million, two hundred twenty-nine thousand, eighty-six".