861387 has 8 divisors (see below), whose sum is σ = 1188240. Its totient is φ = 554400.

The previous prime is 861361. The next prime is 861391. The reversal of 861387 is 783168.

861387 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 not a de Polignac number, because 861387 - 2⁸ = 861131 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 861387.

It is not an unprimeable number, because it can be changed into a prime (861317) 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, 4864 + ... + 5037.

It is an arithmetic number, because the mean of its divisors is an integer number (148530).

2⁸⁶¹³⁸⁷ is an apocalyptic number.

861387 is a gapful number since it is divisible by the number (87) formed by its first and last digit.

861387 is a deficient number, since it is larger than the sum of its proper divisors (326853).

861387 is a wasteful number, since it uses less digits than its factorization.

861387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9933.

The product of its digits is 8064, while the sum is 33.

The square root of 861387 is about 928.1093685552. The cubic root of 861387 is about 95.1479504451.

The spelling of 861387 in words is "eight hundred sixty-one thousand, three hundred eighty-seven".