279487 has 4 divisors (see below), whose sum is σ = 301000. Its totient is φ = 257976.

The previous prime is 279481. The next prime is 279511. The reversal of 279487 is 784972.

It is a happy number.

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 279487 - 2³ = 279479 is a prime.

It is a super-2 number, since 2×279487² = 156225966338, which contains 22 as substring.

It is a d-powerful number, because it can be written as 2⁹ + 7 + 4⁹ + 9 + 8 + 7⁵ .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (279481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10737 + ... + 10762.

It is an arithmetic number, because the mean of its divisors is an integer number (75250).

2²⁷⁹⁴⁸⁷ is an apocalyptic number.

279487 is a deficient number, since it is larger than the sum of its proper divisors (21513).

279487 is a wasteful number, since it uses less digits than its factorization.

279487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21512.

The product of its digits is 28224, while the sum is 37.

The square root of 279487 is about 528.6653005447. The cubic root of 279487 is about 65.3813480401.

The spelling of 279487 in words is "two hundred seventy-nine thousand, four hundred eighty-seven".