978831 has 16 divisors (see below), whose sum is σ = 1657600. Its totient is φ = 559224.

The previous prime is 978821. The next prime is 978839. The reversal of 978831 is 138879.

It is not a de Polignac number, because 978831 - 2⁵ = 978799 is a prime.

It is a super-2 number, since 2×978831² = 1916220253122, which contains 22 as substring.

It is a congruent 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 15 ways as a sum of consecutive naturals, for example, 2401 + ... + 2778.

It is an arithmetic number, because the mean of its divisors is an integer number (103600).

2⁹⁷⁸⁸³¹ is an apocalyptic number.

978831 is a deficient number, since it is larger than the sum of its proper divisors (678769).

978831 is a wasteful number, since it uses less digits than its factorization.

978831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5195 (or 5189 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 978831 is about 989.3588833179. The cubic root of 978831 is about 99.2893280852.

The spelling of 978831 in words is "nine hundred seventy-eight thousand, eight hundred thirty-one".