978899 has 4 divisors (see below), whose sum is σ = 1030440. Its totient is φ = 927360.

The previous prime is 978883. The next prime is 978907. The reversal of 978899 is 998879.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 998879 = 7 ⋅142697.

It is a cyclic number.

It is not a de Polignac number, because 978899 - 2⁴ = 978883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (978839) 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, 25742 + ... + 25779.

It is an arithmetic number, because the mean of its divisors is an integer number (257610).

2⁹⁷⁸⁸⁹⁹ is an apocalyptic number.

978899 is a deficient number, since it is larger than the sum of its proper divisors (51541).

978899 is a wasteful number, since it uses less digits than its factorization.

978899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51540.

The product of its digits is 326592, while the sum is 50.

The square root of 978899 is about 989.3932484104. The cubic root of 978899 is about 99.2916272625.

The spelling of 978899 in words is "nine hundred seventy-eight thousand, eight hundred ninety-nine".