861287 has 8 divisors (see below), whose sum is σ = 1008672. Its totient is φ = 720000.

The previous prime is 861239. The next prime is 861293. The reversal of 861287 is 782168.

861287 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 861287 - 2⁸ = 861031 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (863287) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1214 + ... + 1787.

It is an arithmetic number, because the mean of its divisors is an integer number (126084).

2⁸⁶¹²⁸⁷ is an apocalyptic number.

861287 is a deficient number, since it is larger than the sum of its proper divisors (147385).

861287 is a wasteful number, since it uses less digits than its factorization.

861287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3049.

The product of its digits is 5376, while the sum is 32.

The square root of 861287 is about 928.0554940304. The cubic root of 861287 is about 95.1442683358.

The spelling of 861287 in words is "eight hundred sixty-one thousand, two hundred eighty-seven".