439978 has 16 divisors (see below), whose sum is σ = 823104. Its totient is φ = 171360.

The previous prime is 439973. The next prime is 439981. The reversal of 439978 is 879934.

It is a self number, because there is not a number n which added to its sum of digits gives 439978.

It is not an unprimeable number, because it can be changed into a prime (439973) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1275 + ... + 1582.

It is an arithmetic number, because the mean of its divisors is an integer number (51444).

2⁴³⁹⁹⁷⁸ is an apocalyptic number.

439978 is a deficient number, since it is larger than the sum of its proper divisors (383126).

439978 is a wasteful number, since it uses less digits than its factorization.

439978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2877.

The product of its digits is 54432, while the sum is 40.

The square root of 439978 is about 663.3083747398. The cubic root of 439978 is about 76.0577815433.

The spelling of 439978 in words is "four hundred thirty-nine thousand, nine hundred seventy-eight".