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1280220 = 2235191123
BaseRepresentation
bin100111000100011011100
32102001010120
410320203130
5311431340
643234540
713611264
oct4704334
92361116
101280220
117a4937
12518a50
1335a936
142547a4
151a44d0
hex1388dc

1280220 has 48 divisors (see below), whose sum is σ = 3776640. Its totient is φ = 323136.

The previous prime is 1280183. The next prime is 1280221. The reversal of 1280220 is 220821.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1280220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1280221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 579 + ... + 1701.

It is an arithmetic number, because the mean of its divisors is an integer number (78680).

21280220 is an apocalyptic number.

1280220 is a gapful number since it is divisible by the number (10) 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 1280220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1888320).

1280220 is an abundant number, since it is smaller than the sum of its proper divisors (2496420).

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

1280220 is a wasteful number, since it uses less digits than its factorization.

1280220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1154 (or 1152 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 1280220 is about 1131.4680729035. The cubic root of 1280220 is about 108.5829248478.

The spelling of 1280220 in words is "one million, two hundred eighty thousand, two hundred twenty".

Divisors: 1 2 3 4 5 6 10 12 15 19 20 30 38 57 60 76 95 114 190 228 285 380 570 1123 1140 2246 3369 4492 5615 6738 11230 13476 16845 21337 22460 33690 42674 64011 67380 85348 106685 128022 213370 256044 320055 426740 640110 1280220