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1280240 = 245131231
BaseRepresentation
bin100111000100011110000
32102001011022
410320203300
5311431430
643235012
713611323
oct4704360
92361138
101280240
117a4955
12518a68
1335a950
142547ba
151a44e5
hex1388f0

1280240 has 40 divisors (see below), whose sum is σ = 3208128. Its totient is φ = 472320.

The previous prime is 1280231. The next prime is 1280267. The reversal of 1280240 is 420821.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 425 + ... + 1655.

21280240 is an apocalyptic number.

1280240 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 1280240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1604064).

1280240 is an abundant number, since it is smaller than the sum of its proper divisors (1927888).

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

1280240 is a wasteful number, since it uses less digits than its factorization.

1280240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1257 (or 1251 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 1280240 is about 1131.4769109443. The cubic root of 1280240 is about 108.5834902838.

The spelling of 1280240 in words is "one million, two hundred eighty thousand, two hundred forty".

Divisors: 1 2 4 5 8 10 13 16 20 26 40 52 65 80 104 130 208 260 520 1040 1231 2462 4924 6155 9848 12310 16003 19696 24620 32006 49240 64012 80015 98480 128024 160030 256048 320060 640120 1280240