978890 has 24 divisors (see below), whose sum is σ = 1939140. Its totient is φ = 355520.

The previous prime is 978883. The next prime is 978907. The reversal of 978890 is 98879.

It can be written as a sum of positive squares in 2 ways, for example, as 958441 + 20449 = 979^2 + 143^2 .

It is a congruent number.

It is an unprimeable number.

978890 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 806 + ... + 1614.

2⁹⁷⁸⁸⁹⁰ is an apocalyptic number.

978890 is a deficient number, since it is larger than the sum of its proper divisors (960250).

978890 is a wasteful number, since it uses less digits than its factorization.

978890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 838 (or 827 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 41.

The square root of 978890 is about 989.3887001578. The cubic root of 978890 is about 99.2913229657.

The spelling of 978890 in words is "nine hundred seventy-eight thousand, eight hundred ninety".