989992 has 16 divisors (see below), whose sum is σ = 1884960. Its totient is φ = 487344.

The previous prime is 989981. The next prime is 989999. The reversal of 989992 is 299989.

It is a happy number.

989992 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×989992³ = 2910826433370238464, which contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (989999) 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, 388 + ... + 1459.

It is an arithmetic number, because the mean of its divisors is an integer number (117810).

2⁹⁸⁹⁹⁹² is an apocalyptic number.

It is an amenable number.

989992 is a deficient number, since it is larger than the sum of its proper divisors (894968).

989992 is a wasteful number, since it uses less digits than its factorization.

989992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1920 (or 1916 counting only the distinct ones).

The product of its digits is 104976, while the sum is 46.

The square root of 989992 is about 994.9834169472. The cubic root of 989992 is about 99.6652808811.

The spelling of 989992 in words is "nine hundred eighty-nine thousand, nine hundred ninety-two".