279709920859 has 4 divisors (see below), whose sum is σ = 281587168800. Its totient is φ = 277832672920.

The previous prime is 279709920829. The next prime is 279709920887. The reversal of 279709920859 is 958029907972.

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 279709920859 - 2¹⁷ = 279709789787 is a prime.

It is a Smith number, since the sum of its digits (67) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 279709920794 and 279709920803.

It is not an unprimeable number, because it can be changed into a prime (279709920829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 938623747 + ... + 938624044.

It is an arithmetic number, because the mean of its divisors is an integer number (70396792200).

Almost surely, 2^279709920859 is an apocalyptic number.

279709920859 is a deficient number, since it is larger than the sum of its proper divisors (1877247941).

279709920859 is a wasteful number, since it uses less digits than its factorization.

279709920859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1877247940.

The product of its (nonzero) digits is 51438240, while the sum is 67.

The spelling of 279709920859 in words is "two hundred seventy-nine billion, seven hundred nine million, nine hundred twenty thousand, eight hundred fifty-nine".