79815 has 16 divisors (see below), whose sum is σ = 135648. Its totient is φ = 39936.

The previous prime is 79813. The next prime is 79817. The reversal of 79815 is 51897.

It is an interprime number because it is at equal distance from previous prime (79813) and next prime (79817).

It is not a de Polignac number, because 79815 - 2¹ = 79813 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 79815.

It is not an unprimeable number, because it can be changed into a prime (79811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 99 + ... + 411.

It is an arithmetic number, because the mean of its divisors is an integer number (8478).

2⁷⁹⁸¹⁵ is an apocalyptic number.

79815 is a deficient number, since it is larger than the sum of its proper divisors (55833).

79815 is a wasteful number, since it uses less digits than its factorization.

79815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338.

The product of its digits is 2520, while the sum is 30.

The square root of 79815 is about 282.5154863012. The cubic root of 79815 is about 43.0554539636.

The spelling of 79815 in words is "seventy-nine thousand, eight hundred fifteen".