861727827 has 4 divisors (see below), whose sum is σ = 1148970440. Its totient is φ = 574485216.

The previous prime is 861727793. The next prime is 861727831. The reversal of 861727827 is 728727168.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 861727827 - 2⁸ = 861727571 is a prime.

It is a super-2 number, since 2×861727827² = 1485149695652283858, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (861727897) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 143621302 + ... + 143621307.

It is an arithmetic number, because the mean of its divisors is an integer number (287242610).

Almost surely, 2^861727827 is an apocalyptic number.

861727827 is a deficient number, since it is larger than the sum of its proper divisors (287242613).

861727827 is a wasteful number, since it uses less digits than its factorization.

861727827 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287242612.

The product of its digits is 526848, while the sum is 48.

The square root of 861727827 is about 29355.2010212841. The cubic root of 861727827 is about 951.6049792739.

The spelling of 861727827 in words is "eight hundred sixty-one million, seven hundred twenty-seven thousand, eight hundred twenty-seven".