986978 has 8 divisors (see below), whose sum is σ = 1528320. Its totient is φ = 477540.

The previous prime is 986963. The next prime is 986981. The reversal of 986978 is 879689.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 986978.

It is an unprimeable number.

986978 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7898 + ... + 8021.

It is an arithmetic number, because the mean of its divisors is an integer number (191040).

2⁹⁸⁶⁹⁷⁸ is an apocalyptic number.

986978 is a deficient number, since it is larger than the sum of its proper divisors (541342).

986978 is a wasteful number, since it uses less digits than its factorization.

986978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15952.

The product of its digits is 217728, while the sum is 47.

The square root of 986978 is about 993.4676642951. The cubic root of 986978 is about 99.5640354445.

The spelling of 986978 in words is "nine hundred eighty-six thousand, nine hundred seventy-eight".