989851 has 4 divisors (see below), whose sum is σ = 1032912. Its totient is φ = 946792.

The previous prime is 989839. The next prime is 989869. The reversal of 989851 is 158989.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 158989 = 37 ⋅4297.

It is a cyclic number.

It is not a de Polignac number, because 989851 - 2¹¹ = 987803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (989831) 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, 21496 + ... + 21541.

It is an arithmetic number, because the mean of its divisors is an integer number (258228).

2⁹⁸⁹⁸⁵¹ is an apocalyptic number.

989851 is a deficient number, since it is larger than the sum of its proper divisors (43061).

989851 is a wasteful number, since it uses less digits than its factorization.

989851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43060.

The product of its digits is 25920, while the sum is 40.

The square root of 989851 is about 994.9125589719. The cubic root of 989851 is about 99.6605490342.

The spelling of 989851 in words is "nine hundred eighty-nine thousand, eight hundred fifty-one".