279961 has 8 divisors (see below), whose sum is σ = 315648. Its totient is φ = 246000.

The previous prime is 279949. The next prime is 279967. The reversal of 279961 is 169972.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 279961 - 2¹³ = 271769 is a prime.

It is a Duffinian number.

279961 is a lucky number.

It is a plaindrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (279967) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70 + ... + 751.

It is an arithmetic number, because the mean of its divisors is an integer number (39456).

279961 is a Friedman number, since it can be written as 9+6^7+2*(9-1), using all its digits and the basic arithmetic operations.

2²⁷⁹⁹⁶¹ is an apocalyptic number.

It is an amenable number.

279961 is a deficient number, since it is larger than the sum of its proper divisors (35687).

279961 is a wasteful number, since it uses less digits than its factorization.

279961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 863.

The product of its digits is 6804, while the sum is 34.

The square root of 279961 is about 529.1134093935. The cubic root of 279961 is about 65.4182886440.

The spelling of 279961 in words is "two hundred seventy-nine thousand, nine hundred sixty-one".