679405 has 8 divisors (see below), whose sum is σ = 863352. Its totient is φ = 511488.

The previous prime is 679403. The next prime is 679409. The reversal of 679405 is 504976.

It can be written as a sum of positive squares in 4 ways, for example, as 34596 + 644809 = 186^2 + 803^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 679405 - 2¹ = 679403 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 (679403) 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 7 ways as a sum of consecutive naturals, for example, 3912 + ... + 4081.

It is an arithmetic number, because the mean of its divisors is an integer number (107919).

2⁶⁷⁹⁴⁰⁵ is an apocalyptic number.

It is an amenable number.

679405 is a deficient number, since it is larger than the sum of its proper divisors (183947).

679405 is a wasteful number, since it uses less digits than its factorization.

679405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8015.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 679405 is about 824.2602744279. The cubic root of 679405 is about 87.9109377857.

The spelling of 679405 in words is "six hundred seventy-nine thousand, four hundred five".