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243040 = 2557231
BaseRepresentation
bin111011010101100000
3110100101111
4323111200
530234130
65113104
72031400
oct732540
9410344
10243040
11156666
12b8794
1386815
1464800
154c02a
hex3b560

243040 has 72 divisors (see below), whose sum is σ = 689472. Its totient is φ = 80640.

The previous prime is 243031. The next prime is 243073. The reversal of 243040 is 40342.

Adding to 243040 its reverse (40342), we get a palindrome (283382).

243040 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a plaindrome in base 11.

It is a self number, because there is not a number n which added to its sum of digits gives 243040.

It is a congruent number.

It is an unprimeable number.

243040 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7825 + ... + 7855.

It is an arithmetic number, because the mean of its divisors is an integer number (9576).

2243040 is an apocalyptic number.

243040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 243040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (344736).

243040 is an abundant number, since it is smaller than the sum of its proper divisors (446432).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

243040 is a wasteful number, since it uses less digits than its factorization.

243040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60 (or 45 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 13.

The square root of 243040 is about 492.9908721265. The cubic root of 243040 is about 62.4059385100.

The spelling of 243040 in words is "two hundred forty-three thousand, forty", and thus it is an iban number.

Divisors: 1 2 4 5 7 8 10 14 16 20 28 31 32 35 40 49 56 62 70 80 98 112 124 140 155 160 196 217 224 245 248 280 310 392 434 490 496 560 620 784 868 980 992 1085 1120 1240 1519 1568 1736 1960 2170 2480 3038 3472 3920 4340 4960 6076 6944 7595 7840 8680 12152 15190 17360 24304 30380 34720 48608 60760 121520 243040