679984 has 10 divisors (see below), whose sum is σ = 1317500. Its totient is φ = 339984.

The previous prime is 679981. The next prime is 679993. The reversal of 679984 is 489976.

It is a plaindrome in base 9.

It is a self number, because there is not a number n which added to its sum of digits gives 679984.

It is not an unprimeable number, because it can be changed into a prime (679981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21234 + ... + 21265.

It is an arithmetic number, because the mean of its divisors is an integer number (131750).

2⁶⁷⁹⁹⁸⁴ is an apocalyptic number.

It is an amenable number.

679984 is a deficient number, since it is larger than the sum of its proper divisors (637516).

679984 is a wasteful number, since it uses less digits than its factorization.

679984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42507 (or 42501 counting only the distinct ones).

The product of its digits is 108864, while the sum is 43.

The square root of 679984 is about 824.6114236415. The cubic root of 679984 is about 87.9359037390.

The spelling of 679984 in words is "six hundred seventy-nine thousand, nine hundred eighty-four".