279391 has 8 divisors (see below), whose sum is σ = 322560. Its totient is φ = 237048.

The previous prime is 279353. The next prime is 279397. The reversal of 279391 is 193972.

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

It is not a de Polignac number, because 279391 - 2⁹ = 278879 is a prime.

279391 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (279397) 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, 1050 + ... + 1288.

It is an arithmetic number, because the mean of its divisors is an integer number (40320).

2²⁷⁹³⁹¹ is an apocalyptic number.

279391 is a deficient number, since it is larger than the sum of its proper divisors (43169).

279391 is a wasteful number, since it uses less digits than its factorization.

279391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413.

The product of its digits is 3402, while the sum is 31.

The square root of 279391 is about 528.5744980606. The cubic root of 279391 is about 65.3738613136.

The spelling of 279391 in words is "two hundred seventy-nine thousand, three hundred ninety-one".