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279442 = 2139721
BaseRepresentation
bin1000100001110010010
3112012022201
41010032102
532420232
65553414
72242462
oct1041622
9465281
10279442
11180a49
1211586a
139a267
1473ba2
1557be7
hex44392

279442 has 4 divisors (see below), whose sum is σ = 419166. Its totient is φ = 139720.

The previous prime is 279431. The next prime is 279443. The reversal of 279442 is 244972.

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

It can be written as a sum of positive squares in only one way, i.e., 201601 + 77841 = 449^2 + 279^2 .

It is a d-powerful number, because it can be written as 23 + 72 + 47 + 93 + 49 + 27 .

It is a self number, because there is not a number n which added to its sum of digits gives 279442.

It is not an unprimeable number, because it can be changed into a prime (279443) by changing a digit.

279442 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69859 + ... + 69862.

2279442 is an apocalyptic number.

279442 is a deficient number, since it is larger than the sum of its proper divisors (139724).

279442 is a wasteful number, since it uses less digits than its factorization.

279442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139723.

The product of its digits is 4032, while the sum is 28.

The square root of 279442 is about 528.6227388223. The cubic root of 279442 is about 65.3778388505.

The spelling of 279442 in words is "two hundred seventy-nine thousand, four hundred forty-two".

Divisors: 1 2 139721 279442