860989 has 4 divisors (see below), whose sum is σ = 881056. Its totient is φ = 840924.

The previous prime is 860971. The next prime is 861001. The reversal of 860989 is 989068.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 860989 - 2⁵ = 860957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (860929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9969 + ... + 10054.

It is an arithmetic number, because the mean of its divisors is an integer number (220264).

2⁸⁶⁰⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

860989 is a deficient number, since it is larger than the sum of its proper divisors (20067).

860989 is a wasteful number, since it uses less digits than its factorization.

860989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20066.

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 860989 is about 927.8949293966. The cubic root of 860989 is about 95.1332939596.

It can be divided in two parts, 860 and 989, that added together give a square (1849 = 43²).

The spelling of 860989 in words is "eight hundred sixty thousand, nine hundred eighty-nine".