79906 has 4 divisors (see below), whose sum is σ = 119862. Its totient is φ = 39952.

The previous prime is 79903. The next prime is 79907. The reversal of 79906 is 60997.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60997 = 181 ⋅337.

It can be written as a sum of positive squares in only one way, i.e., 60025 + 19881 = 245^2 + 141^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (79901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19975 + ... + 19978.

2⁷⁹⁹⁰⁶ is an apocalyptic number.

79906 is a deficient number, since it is larger than the sum of its proper divisors (39956).

79906 is a wasteful number, since it uses less digits than its factorization.

79906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39955.

The product of its (nonzero) digits is 3402, while the sum is 31.

The square root of 79906 is about 282.6764935399. The cubic root of 79906 is about 43.0718107813.

The spelling of 79906 in words is "seventy-nine thousand, nine hundred six".