861887 has 8 divisors (see below), whose sum is σ = 936096. Its totient is φ = 788832.
The previous prime is 861881. The next prime is 861899. The reversal of 861887 is 788168.
It is a sphenic number, since it is the product of 3 distinct primes.
It is a cyclic number.
It is not a de Polignac number, because 861887 - 24 = 861871 is a prime.
It is a Duffinian number.
It is a self number, because there is not a number n which added to its sum of digits gives 861887.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (861881) by changing a digit.
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, 1973 + ... + 2369.
It is an arithmetic number, because the mean of its divisors is an integer number (117012).
2861887 is an apocalyptic number.
861887 is a deficient number, since it is larger than the sum of its proper divisors (74209).
861887 is a wasteful number, since it uses less digits than its factorization.
861887 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 577.
The product of its digits is 21504, while the sum is 38.
The square root of 861887 is about 928.3786942837. The cubic root of 861887 is about 95.1663567183.
The spelling of 861887 in words is "eight hundred sixty-one thousand, eight hundred eighty-seven".
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