79869999 has 16 divisors (see below), whose sum is σ = 116348544. Its totient is φ = 48333600.

The previous prime is 79869997. The next prime is 79870001. The reversal of 79869999 is 99996897.

It is an interprime number because it is at equal distance from previous prime (79869997) and next prime (79870001).

It is not a de Polignac number, because 79869999 - 2¹ = 79869997 is a prime.

79869999 is a modest number, since divided by 9999 gives 7986 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79869997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27769 + ... + 30509.

It is an arithmetic number, because the mean of its divisors is an integer number (7271784).

Almost surely, 2^79869999 is an apocalyptic number.

79869999 is a deficient number, since it is larger than the sum of its proper divisors (36478545).

79869999 is a wasteful number, since it uses less digits than its factorization.

79869999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3638.

The product of its digits is 19840464, while the sum is 66.

The square root of 79869999 is about 8937.0016784154. The cubic root of 79869999 is about 430.6534125800.

It can be divided in two parts, 79 and 869999, that added together give a palindrome (870078).

The spelling of 79869999 in words is "seventy-nine million, eight hundred sixty-nine thousand, nine hundred ninety-nine".