679949 has 16 divisors (see below), whose sum is σ = 787968. Its totient is φ = 582912.

The previous prime is 679933. The next prime is 679951. The reversal of 679949 is 949976.

It is not a de Polignac number, because 679949 - 2⁴ = 679933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (679909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14444 + ... + 14490.

It is an arithmetic number, because the mean of its divisors is an integer number (49248).

2⁶⁷⁹⁹⁴⁹ is an apocalyptic number.

It is an amenable number.

679949 is a deficient number, since it is larger than the sum of its proper divisors (108019).

679949 is a wasteful number, since it uses less digits than its factorization.

679949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124.

The product of its digits is 122472, while the sum is 44.

The square root of 679949 is about 824.5902012515. The cubic root of 679949 is about 87.9343949734.

The spelling of 679949 in words is "six hundred seventy-nine thousand, nine hundred forty-nine".