279742 has 4 divisors (see below), whose sum is σ = 419616. Its totient is φ = 139870.

The previous prime is 279731. The next prime is 279751. The reversal of 279742 is 247972.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a plaindrome in base 16.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69934 + ... + 69937.

It is an arithmetic number, because the mean of its divisors is an integer number (104904).

279742 is a Friedman number, since it can be written as (4+2)^7-97*2, using all its digits and the basic arithmetic operations.

2²⁷⁹⁷⁴² is an apocalyptic number.

279742 is a deficient number, since it is larger than the sum of its proper divisors (139874).

279742 is a wasteful number, since it uses less digits than its factorization.

279742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139873.

The product of its digits is 7056, while the sum is 31.

The square root of 279742 is about 528.9064189438. The cubic root of 279742 is about 65.4012263359.

The spelling of 279742 in words is "two hundred seventy-nine thousand, seven hundred forty-two".