979639 has 8 divisors (see below), whose sum is σ = 1032192. Its totient is φ = 927960.

The previous prime is 979567. The next prime is 979651. The reversal of 979639 is 936979.

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 979639 - 2¹¹ = 977591 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 979595 and 979604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (979439) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4282 + ... + 4504.

It is an arithmetic number, because the mean of its divisors is an integer number (129024).

2⁹⁷⁹⁶³⁹ is an apocalyptic number.

979639 is a deficient number, since it is larger than the sum of its proper divisors (52553).

979639 is a wasteful number, since it uses less digits than its factorization.

979639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437.

The product of its digits is 91854, while the sum is 43.

The square root of 979639 is about 989.7671443324. The cubic root of 979639 is about 99.3166408397.

The spelling of 979639 in words is "nine hundred seventy-nine thousand, six hundred thirty-nine".