279971 has 4 divisors (see below), whose sum is σ = 282000. Its totient is φ = 277944.

The previous prime is 279967. The next prime is 279977. The reversal of 279971 is 179972.

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 279971 - 2² = 279967 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (279977) 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, 791 + ... + 1088.

It is an arithmetic number, because the mean of its divisors is an integer number (70500).

2²⁷⁹⁹⁷¹ is an apocalyptic number.

279971 is a deficient number, since it is larger than the sum of its proper divisors (2029).

279971 is a wasteful number, since it uses less digits than its factorization.

279971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2028.

The product of its digits is 7938, while the sum is 35.

The square root of 279971 is about 529.1228590791. The cubic root of 279971 is about 65.4190675324.

Subtracting from 279971 its sum of digits (35), we obtain a 7-th power (279936 = 6⁷).

Subtracting from 279971 its reverse (179972), we obtain a palindrome (99999).

The spelling of 279971 in words is "two hundred seventy-nine thousand, nine hundred seventy-one".