84800439979 has 4 divisors (see below), whose sum is σ = 85122875376. Its totient is φ = 84478004584.

The previous prime is 84800439949. The next prime is 84800440001. The reversal of 84800439979 is 97993400848.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 84800439979 - 2¹⁹ = 84799915691 is a prime.

It is a super-2 number, since 2×84800439979² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84800439949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 161217304 + ... + 161217829.

It is an arithmetic number, because the mean of its divisors is an integer number (21280718844).

Almost surely, 2^84800439979 is an apocalyptic number.

84800439979 is a deficient number, since it is larger than the sum of its proper divisors (322435397).

84800439979 is a wasteful number, since it uses less digits than its factorization.

84800439979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322435396.

The product of its (nonzero) digits is 15676416, while the sum is 61.

The spelling of 84800439979 in words is "eighty-four billion, eight hundred million, four hundred thirty-nine thousand, nine hundred seventy-nine".