861212785 has 8 divisors (see below), whose sum is σ = 1033635456. Its totient is φ = 688850160.

The previous prime is 861212771. The next prime is 861212801. The reversal of 861212785 is 587212168.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 861212785 - 2¹¹ = 861210737 is a prime.

It is a super-2 number, since 2×861212785² = 1483374922094912450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27490 + ... + 49780.

It is an arithmetic number, because the mean of its divisors is an integer number (129204432).

Almost surely, 2^861212785 is an apocalyptic number.

It is an amenable number.

861212785 is a deficient number, since it is larger than the sum of its proper divisors (172422671).

861212785 is a wasteful number, since it uses less digits than its factorization.

861212785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30023.

The product of its digits is 53760, while the sum is 40.

The square root of 861212785 is about 29346.4271249500. The cubic root of 861212785 is about 951.4153547413.

The spelling of 861212785 in words is "eight hundred sixty-one million, two hundred twelve thousand, seven hundred eighty-five".