978847 has 4 divisors (see below), whose sum is σ = 981000. Its totient is φ = 976696.

The previous prime is 978839. The next prime is 978851. The reversal of 978847 is 748879.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 748879 = 409 ⋅1831.

It is a cyclic number.

It is not a de Polignac number, because 978847 - 2³ = 978839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (978347) 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, 97 + ... + 1402.

It is an arithmetic number, because the mean of its divisors is an integer number (245250).

2⁹⁷⁸⁸⁴⁷ is an apocalyptic number.

978847 is a deficient number, since it is larger than the sum of its proper divisors (2153).

978847 is a wasteful number, since it uses less digits than its factorization.

978847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2152.

The product of its digits is 112896, while the sum is 43.

The square root of 978847 is about 989.3669693294. The cubic root of 978847 is about 99.2898690777.

The spelling of 978847 in words is "nine hundred seventy-eight thousand, eight hundred forty-seven".