989778 has 8 divisors (see below), whose sum is σ = 1979568. Its totient is φ = 329924.

The previous prime is 989777. The next prime is 989783. The reversal of 989778 is 877989.

989778 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

989778 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (989777) 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, 82476 + ... + 82487.

It is an arithmetic number, because the mean of its divisors is an integer number (247446).

2⁹⁸⁹⁷⁷⁸ is an apocalyptic number.

989778 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

989778 is a wasteful number, since it uses less digits than its factorization.

989778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164968.

The product of its digits is 254016, while the sum is 48.

The square root of 989778 is about 994.8758716543. The cubic root of 989778 is about 99.6580990362.

The spelling of 989778 in words is "nine hundred eighty-nine thousand, seven hundred seventy-eight".