79821115 has 16 divisors (see below), whose sum is σ = 106926336. Its totient is φ = 56700000.

The previous prime is 79821113. The next prime is 79821121. The reversal of 79821115 is 51112897.

It is a happy number.

It is not a de Polignac number, because 79821115 - 2¹ = 79821113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (79821113) 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, 14511 + ... + 19240.

It is an arithmetic number, because the mean of its divisors is an integer number (6682896).

Almost surely, 2^79821115 is an apocalyptic number.

79821115 is a deficient number, since it is larger than the sum of its proper divisors (27105221).

79821115 is a wasteful number, since it uses less digits than its factorization.

79821115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33810.

The product of its digits is 5040, while the sum is 34.

The square root of 79821115 is about 8934.2663380940. The cubic root of 79821115 is about 430.5655349535.

The spelling of 79821115 in words is "seventy-nine million, eight hundred twenty-one thousand, one hundred fifteen".