985978 has 12 divisors (see below), whose sum is σ = 1720602. Its totient is φ = 422520.

The previous prime is 985973. The next prime is 985979. The reversal of 985978 is 879589.

It can be written as a sum of positive squares in only one way, i.e., 815409 + 170569 = 903^2 + 413^2 .

It is not an unprimeable number, because it can be changed into a prime (985973) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4933 + ... + 5128.

2⁹⁸⁵⁹⁷⁸ is an apocalyptic number.

985978 is a gapful number since it is divisible by the number (98) formed by its first and last digit.

985978 is a deficient number, since it is larger than the sum of its proper divisors (734624).

985978 is a wasteful number, since it uses less digits than its factorization.

985978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10077 (or 10070 counting only the distinct ones).

The product of its digits is 181440, while the sum is 46.

The square root of 985978 is about 992.9642491047. The cubic root of 985978 is about 99.5303981934.

The spelling of 985978 in words is "nine hundred eighty-five thousand, nine hundred seventy-eight".