79905 has 16 divisors (see below), whose sum is σ = 146304. Its totient is φ = 36480.
The previous prime is 79903. The next prime is 79907. The reversal of 79905 is 50997.
It is a happy number.
It is an interprime number because it is at equal distance from previous prime (79903) and next prime (79907).
It is not a de Polignac number, because 79905 - 21 = 79903 is a prime.
It is a Curzon number.
79905 is a lucky 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 in 15 ways as a sum of consecutive naturals, for example, 276 + ... + 485.
It is an arithmetic number, because the mean of its divisors is an integer number (9144).
279905 is an apocalyptic number.
It is an amenable number.
79905 is a deficient number, since it is larger than the sum of its proper divisors (66399).
79905 is a wasteful number, since it uses less digits than its factorization.
79905 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 776.
The product of its (nonzero) digits is 2835, while the sum is 30.
The square root of 79905 is about 282.6747247279. The cubic root of 79905 is about 43.0716311036.
The spelling of 79905 in words is "seventy-nine thousand, nine hundred five".
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