989878 has 4 divisors (see below), whose sum is σ = 1484820. Its totient is φ = 494938.

The previous prime is 989873. The next prime is 989887. The reversal of 989878 is 878989.

989878 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

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

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 247468 + ... + 247471.

It is an arithmetic number, because the mean of its divisors is an integer number (371205).

2⁹⁸⁹⁸⁷⁸ is an apocalyptic number.

989878 is a deficient number, since it is larger than the sum of its proper divisors (494942).

989878 is a wasteful number, since it uses less digits than its factorization.

989878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 494941.

The product of its digits is 290304, while the sum is 49.

The square root of 989878 is about 994.9261279110. The cubic root of 989878 is about 99.6614551673.

Subtracting from 989878 its reverse (878989), we obtain a square (110889 = 333²).

The spelling of 989878 in words is "nine hundred eighty-nine thousand, eight hundred seventy-eight".