978838 has 16 divisors (see below), whose sum is σ = 1693440. Its totient is φ = 415656.

The previous prime is 978821. The next prime is 978839. The reversal of 978838 is 838879.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 978794 and 978803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (978839) by changing a digit.

978838 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 7 ways as a sum of consecutive naturals, for example, 1695 + ... + 2197.

It is an arithmetic number, because the mean of its divisors is an integer number (105840).

2⁹⁷⁸⁸³⁸ is an apocalyptic number.

978838 is a deficient number, since it is larger than the sum of its proper divisors (714602).

978838 is a wasteful number, since it uses less digits than its factorization.

978838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 651.

The product of its digits is 96768, while the sum is 43.

The square root of 978838 is about 989.3624209560. The cubic root of 978838 is about 99.2895647702.

The spelling of 978838 in words is "nine hundred seventy-eight thousand, eight hundred thirty-eight".