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BaseRepresentation
bin100111000101101110111
32102002001021
410320231313
5311442022
643242011
713613236
oct4705567
92362037
101280887
117a5393
12519307
1335b02a
14254b1d
151a47c7
hex138b77

1280887 has 2 divisors, whose sum is σ = 1280888. Its totient is φ = 1280886.

The previous prime is 1280869. The next prime is 1280921. The reversal of 1280887 is 7880821.

It is an a-pointer prime, because the next prime (1280921) can be obtained adding 1280887 to its sum of digits (34).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1280887 - 27 = 1280759 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1280837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640443 + 640444.

It is an arithmetic number, because the mean of its divisors is an integer number (640444).

21280887 is an apocalyptic number.

1280887 is a deficient number, since it is larger than the sum of its proper divisors (1).

1280887 is an equidigital number, since it uses as much as digits as its factorization.

1280887 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7168, while the sum is 34.

The square root of 1280887 is about 1131.7627843325. The cubic root of 1280887 is about 108.6017789606.

The spelling of 1280887 in words is "one million, two hundred eighty thousand, eight hundred eighty-seven".