861846987 has 4 divisors (see below), whose sum is σ = 1149129320. Its totient is φ = 574564656.

The previous prime is 861846971. The next prime is 861846989. The reversal of 861846987 is 789648168.

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

It is not a de Polignac number, because 861846987 - 2⁴ = 861846971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (861846989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 143641162 + ... + 143641167.

It is an arithmetic number, because the mean of its divisors is an integer number (287282330).

Almost surely, 2^861846987 is an apocalyptic number.

861846987 is a deficient number, since it is larger than the sum of its proper divisors (287282333).

861846987 is a wasteful number, since it uses less digits than its factorization.

861846987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287282332.

The product of its digits is 4644864, while the sum is 57.

The square root of 861846987 is about 29357.2305744258. The cubic root of 861846987 is about 951.6488399994.

The spelling of 861846987 in words is "eight hundred sixty-one million, eight hundred forty-six thousand, nine hundred eighty-seven".