989986 has 8 divisors (see below), whose sum is σ = 1521324. Its totient is φ = 482880.

The previous prime is 989981. The next prime is 989999. The reversal of 989986 is 689989.

989986 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 670761 + 319225 = 819^2 + 565^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (989981) 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, 5955 + ... + 6118.

2⁹⁸⁹⁹⁸⁶ is an apocalyptic number.

989986 is a deficient number, since it is larger than the sum of its proper divisors (531338).

989986 is a wasteful number, since it uses less digits than its factorization.

989986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12116.

The product of its digits is 279936, while the sum is 49.

The square root of 989986 is about 994.9804018170. The cubic root of 989986 is about 99.6650795351.

The spelling of 989986 in words is "nine hundred eighty-nine thousand, nine hundred eighty-six".