679549 has 6 divisors (see below), whose sum is σ = 736026. Its totient is φ = 627120.

The previous prime is 679537. The next prime is 679561. The reversal of 679549 is 945976.

It is an interprime number because it is at equal distance from previous prime (679537) and next prime (679561).

It can be written as a sum of positive squares in 3 ways, for example, as 47524 + 632025 = 218^2 + 795^2 .

It is not a de Polignac number, because 679549 - 2⁵ = 679517 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 (679519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1842 + ... + 2179.

It is an arithmetic number, because the mean of its divisors is an integer number (122671).

2⁶⁷⁹⁵⁴⁹ is an apocalyptic number.

It is an amenable number.

679549 is a deficient number, since it is larger than the sum of its proper divisors (56477).

679549 is a wasteful number, since it uses less digits than its factorization.

679549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4047 (or 4034 counting only the distinct ones).

The product of its digits is 68040, while the sum is 40.

The square root of 679549 is about 824.3476208494. The cubic root of 679549 is about 87.9171482595.

The spelling of 679549 in words is "six hundred seventy-nine thousand, five hundred forty-nine".