989867 has 4 divisors (see below), whose sum is σ = 1010976. Its totient is φ = 968760.

The previous prime is 989839. The next prime is 989869. The reversal of 989867 is 768989.

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

It is a cyclic number.

It is not a de Polignac number, because 989867 - 2⁶ = 989803 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47), and also a Moran number because the ratio is a prime number: 21061 = 989867 / (9 + 8 + 9 + 8 + 6 + 7).

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 989867.

It is not an unprimeable number, because it can be changed into a prime (989869) 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, 10484 + ... + 10577.

It is an arithmetic number, because the mean of its divisors is an integer number (252744).

2⁹⁸⁹⁸⁶⁷ is an apocalyptic number.

989867 is a deficient number, since it is larger than the sum of its proper divisors (21109).

989867 is a wasteful number, since it uses less digits than its factorization.

989867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21108.

The product of its digits is 217728, while the sum is 47.

The square root of 989867 is about 994.9205998470. The cubic root of 989867 is about 99.6610860040.

The spelling of 989867 in words is "nine hundred eighty-nine thousand, eight hundred sixty-seven".