79639 has 8 divisors (see below), whose sum is σ = 94208. Its totient is φ = 65880.

The previous prime is 79633. The next prime is 79657. The reversal of 79639 is 93697.

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 79639 - 2³ = 79631 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 (79631) 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, 34 + ... + 400.

It is an arithmetic number, because the mean of its divisors is an integer number (11776).

2⁷⁹⁶³⁹ is an apocalyptic number.

79639 is a deficient number, since it is larger than the sum of its proper divisors (14569).

79639 is a wasteful number, since it uses less digits than its factorization.

79639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405.

The product of its digits is 10206, while the sum is 34.

The square root of 79639 is about 282.2038270470. The cubic root of 79639 is about 43.0237834897.

The spelling of 79639 in words is "seventy-nine thousand, six hundred thirty-nine".